What is the world's largest fish?
The harmless whale shark holds the title of largest fish, with the record being a 59 footer captured in Thailand in 1919.
Animal facts and facts about animals, from the blue whale to the hound a court will hear as a witness.
417 facts on this shelf
The harmless whale shark holds the title of largest fish, with the record being a 59 footer captured in Thailand in 1919.
Prairie dogs, those little pups popping in and out of holes on vacant lots and rural rangeland, are talking up a storm. They have different "words" for tall human in yellow shirt, short human in green shirt, coyote, deer, red-tailed hawk and many other creatures.
There is an ant in Brazil that has a gland which causes the ant to explode like a bomb, spraying a sticky toxic
goo on everybody nearby. Now that's some hard core biology!
In the ant kingdom some ants are soldiers, or army ants. These soldier ants are so genetically designed to fight,
pinch, clamp and sting that their giant pinchers prevent them from feeding themselves. They must rely
on other ants to feed them.
Siamese fighting fish must be kept isolated because they will fight, immediately, often to the death. In an experiment, 2
fish were dropped in a lake. Would this be enough space? Were these tiny fish interested in exploring?
No, they immediately started fighting.
Submarines have been using low and mid-frequency active sonar technology, a deafening soundwave that is dangerous even 300 miles from it's source. Some mid-frequency sonar systems can put out over 235 decibals, which is about as loud as a rocket launch.
Animals for hundreds of miles literally jump out of the ocean to try to avoid the sound. The damaging effects vary, bet are akin to decompression sickness causing internal bleeding and bursting organs including lungs and eardrums. When beached dolphins are reported this sonar technology is rarely mentioned in the news, although the link has been demonstrated.
What can you do? learn more here
(update: court blocks sonar 7/6/06)
Wolves are capable of covering over 100 miles in a single day.
Wolves can go days on end without food. They can also eat 20 pounds of meat in a single sitting.
Mass beachings have been associated with active sonar
have occurred in Madeira (2000), Greece (1996), the U.S. Virgin Islands (1998, 1999), the Canary Islands (1985, 1988, 1989, 2002), and, northwest coast of the United States (2003).update: court blocks sonar 7/6/06
LFA stands for Low Frequency Active sonar, a technology used by submarines to "see." Unfortunately even one hundred miles from the source of a LFA source animals experience the equivalent of decompression sickness, killing every dolphin, porpoise, orca, and whale within 100-300 miles, depending on the decibal. It's no good for humans either.
Coral reefs are colonies of micro creatures named pollups, little hair-like things that live on the top layer of the coral. The coral grows because when one generation dies they leave behind a hard, stony, branching structure made of limestone which later generations call home.
US farms 1 trillion ears of corn a year, using a chemical called Atrazine that in the concentration of 1 part per billion causes male frogs to grow ovaries! Strangely, a higher dosage reduces the risk. Atrazine is the most widely used weed killer in the United States. It has also been linked to cancer in people.
There are arctic legends that speak of a time when man could understand and speak with whales. In fact, many legends worldwide speak of a time when people and animals understood each other.
In the past few decades 90% of the big fish in the oceans have been eaten, or otherwise disposed of.
A single tree in a rainforest can be home to thousands of different creatures.
The tongue of the Giant Anteater is over 2 feet long... kissy kissy.
During mantis "sex" the male makes the ultimate sacrifice. The female eats the head of the male as a nutritious snack
Blue whales reach between 70-110 feet in length and weigh up to 150 tons.
The blue whale is the largest animal in the world. The largest blue whale caught was a 110-foot female. It is not
known how the angler got this beast home or how they fit it in the freezer.
The oldest animal on Earth was born in 1830 Her name is Harriet, she's a Galapagos land tortoise
The blue whale, the worlds largest animal at 110 feet according to guiness world records eat krill, which are shrimp-like crustaceans only about an inch-and-a-half long.
Pick on somebody your own size? Not whales! An adult whale might slaughter 40 million, or 4-6 tons of these little creatures in one day!!
Amazingly, the krill population persists, but you have to assume this perpetual atrocity affects the krills ability to develop a stable society.
A 1,200-pound horse eats about seven times it's own weight each year.
Chameleons can move their eyes in two different directions at the same time.
A chameleon's tongue is twice the length of its body.
A chimpanzee can learn to recognize itself in a mirror, but monkeys can't.
Whales and dolphins have a tool called echolocation, a sonar which allows them to "see" their prey, even it's internal workings! Noise pollution in the water has a significant effect on whales ability to navigate, hunt, locate their pods, and reproduce.
Echolocating animals have two ears positioned slightly apart. The echoes returning to the two ears arrive at different times and at different loudness levels, depending on the position of the object generating the echoes. The time and loudness differences are used by the animals to perceive direction. With echolocation the bat or other animal can see not only where it's going but can also see how big another animal is, what kind of animal it is, and other features as well. - wikipedia
Many modern submarines use their own sonar a low and mid-frequency sonar is so deafening the pressure waves affect animals on the cellular level, causing the equivalent of "the bends" or decompression sickness. For animals with echolocation this causes sonar function to fail and leaves these animals blind, if they're lucky. What often results is massive beachings (update: court blocks sonar 7/6/06)
Beluga whales are at the top of the food chain. A nice distinction, but it also means they acquire the sum total of toxins acquired by organisms all the way down the chain because these toxins such as PCB and heavy metal poisoning don't break down. Belugas, in fact, are so full of contaminants, when they are found beached they qualify as a toxic biohazard.
A praying mantis will eat a black widow.
A Cornish game hen is really just a young Cornish chicken, usually 5 to 6 weeks of age, that weighs no more than 2 pounds.
A cow gives nearly 200,000 glasses of milk in her lifetime.
A father Emperor penguin withstands the Antarctic cold for 60 days or more to protect his eggs, which he keeps on his feet, covered with a feathered flap. During this entire time he doesn't eat a thing. Most father penguins lose about 25 pounds while they wait for their babies to hatch. Afterward, they feed the chicks a special liquid from their throats. When the mother penguins return to care for the young, the fathers go to sea to eat and rest.
The mackerel is a moderately prolific fish; females of medium size may produce as many as 400,000 to 500,000 eggs in the aggregate, according to various estimates,[10] with 546,000 reported for one weighing 17/8 pounds. But it is seldom that as many as 50,000 are set free at any one time, and often many fewer
A newborn kangaroo is between the size of a grain of rice to the size of a honeybee!
A polecat is not a cat, or a pole. It is a nocturnal European weasel.
A rat can last longer without water than a camel can.
All clams start out as males; about half decide to become females at some point in their lives.
All pet hamsters are descended from a single female wild golden hamster found with a litter of 12 young in Syria in 1930.
A father sea catfish keeps the eggs of his young in his mouth until they are ready to hatch. He will not eat until his young are born, which may take several weeks.
A cow's stomach has four compartments: the rumen, the recticulum (storage area), the omasum (where water is absorbed), and the abomasum ( the only compartment with digestive juices).
Catfish have 100,000 taste buds.
An albatross can sleep while it flies. It apparently dozes while cruising at 25 mph.
An electric eel can produce a shock of up to 650 volts.
An iguana can stay under water for 28 minutes.
Beaver teeth are so sharp that Native Americans once used them as knife blades.
An adult lion's roar can be heard up to five miles away, and warns off intruders or reunites scattered members of the pride.
Catnip can affect lions and tigers as well as house cats. It excites them because it contains a chemical that resembles an excretion of the dominant female's urine.
By feeding hens certain dyes they can be made to lay eggs with varicolored yolks.
Camel milk does not curdle.
Camels have three eyelids to protect themselves from blowing sand.
Carnivorous animals will not eat another animal that has been hit by a lightning strike.
Hippos have killed more than 400 people in Africa - more than any other wild animal.
Dolphins sleep at night just below the surface of the water. They frequently rise to the surface for air.
Dragonflies are one of the fastest insects, flying 50 to 60 mph.
Howler monkeys are the noisiest land animals. Their calls can be heard over 2 miles away.
Hummingbirds are the smallest birds - so tiny that one of their enemies is an insect, the praying mantis. Check out the photo: praying mantis serving dinner
In its entire lifetime, the average worker bee produces 1/12th teaspoon of honey.
The world's largest mammal, the blue whale, weighs 50 tons at birth. Fully grown, it weighs as much as 150 tons.
Swans are the only birds with penises.
The turkey was named for what was wrongly thought to be its country of origin.
Thai researchers have succeeded in generating electricity from natural gas made from elephant dung.
It takes 35 to 65 minks to produce the average mink coat. The numbers for other types of fur coats are: beaver - 15; fox - 15 to 25; ermine - 150; chinchilla - 60 to 100.
Sharks apparently are the only animals that never get sick. As far as is known, they are immune to every known disease including cancer.
An ostrich's eye is bigger than it's brain.
A polar bear's skin is black. Its fur is not white, but actually clear.
Today, only three species of elephant remain and they are all threatened by hunting and habitat destruction.
Galapagos tortoises may reach a length of over 4 ft (120 cm) and weigh over 500 lb (225 kg).
A chicken will lay bigger and stronger eggs if you change the lighting in such a way as to make them think a day is 28 hours long!
Hippos are the third largest animal on land. Only elephants and some rhinos are bigger.
A dairy cow can produce 5 gallons of ice cream a day
All penguin species are restricted to the Southern Hemisphere, but the greatest numerical concentrations are on Antarctic coasts and sub-Antarctic islands.
"Even someone who doesn't know much about horses can learn a lot about equine health just by watching the post parade from the stable to the gates during the May 6 Kentucky Derby, says an equine veterinarian at Purdue University."
A healthy horse has a resting heart rate, of 40-45 beats per minute.
The respiratory rate of an adult horse at rest is 8-16 breaths per minute.
A horse's body temperature is between 98 and 101 degrees.
Elephants can't jump. Every other mammal can.
Humans are the only primates that don't have pigment in the palms
It's possible to lead a cow upstairs... but not downstairs.
It takes 3,000 cows to supply the NFL with enough leather for a year's supply of footballs.
In Cleveland, Ohio, it's illegal to catch mice without a hunting license.
Only one person in two billion will live to be 116 or older.
The longest recorded flight of a chicken is thirteen seconds.
When possums are playing 'possum, they are not "playing." They actually pass out from sheer terror.
A wise monkey never monkies with another monkey's monkey.
Half of all living things live on 6% of the land on the planet, the rain forest. No word on how much this fact changes everyday, but it's safe to say it's an estimate.
Rats can't throw-up
There is no single cat called the panther. The name is commonly applied to the leopard, but it is also used to refer to the puma and the jaguar. A black panther is really a black leopard.
The world's smallest mammal is the bumblebee bat of Thailand, weighing less than a penny.
The bloodhound is the only animal whose evidence is admissible in an American court.
The average adult male ostrich, the world's largest living bird, weighs up to 345 pounds.
The Canary Islands were not named for a bird called a canary. They were named after a breed of large dogs. The Latin name was Canariae insulae - "Island of Dogs."
The Pacific Giant Octopus, the largest octopus in the world, grows from the size of pea to a 150 pound behemoth potentially 30 feet across in only two years, its entire life-span.
A desert snail can sleep for 3 years.
The world's termites outweigh the world's humans 10 to 1.
Monkeys are the only animals that eat bananas
Never seen a horse puke? That's because they can't. Horses have no gag reflex and are incapable of throwing up. Sometimes their inability to throw up causes stomach upsets - which can be fatal.
Bet you didnt know that all polar bears are left handed? (or left pawed if ya gonna be picky)
Polar bears really have black skin and their fur isn't white it is a see through
Elephants can't jump. Every other mammal can.
A cat's urine glows under a blacklight.
The reason firehouses have circular stairways is from the days of yore when the engines were pulled by horses. The horses were stabled on the ground floor and figured out how to walk up straight staircases.
An ostrich does not stick it's head in a hole to hide
The average cost of rehabilitating a seal after the Exxon Valdez oil spill in Alaska was $80,000. At a special ceremony, two of the most expensively saved animals were released back into the wild amid cheers and applause from onlookers. A minute later they were both eaten by a killer whale.
Abdul Kassem Ismael, Grand Vizier of Persia in the tenth century, carried his library with him wherever he went. The 117,000 volumes were carried by 400 camels which were trained to walk in alphabetical order.
There is a two-foot long bird called the Kea. The kea lives in New Zealand and just loves to eat the strips of rubber around car windows.
Spider monkeys like banana daiquiris.
Two animal rights protesters were protesting at the cruelty of sending pigs to a slaughterhouse in Bonn. Suddenly the pigs, all two thousand of them, escaped through a broken fence and stampeded, trampling the two helpless protesters to death.
If you keep a goldfish in the dark room, it will eventually turn white.
A desert snail can sleep for 3 years.
When possums are playing 'possum, they are not "playing." They actually pass out from sheer terror.
The world's smallest mammal is the bumblebee bat of Thailand, weighing less than a penny.
The anaconda, one of the world's largest snakes, gives birth to its young instead of laying eggs.
The average adult male ostrich, the world's largest living bird, weighs up to 345 pounds.
The cheetah is the only cat in the world that can't retract its claws.
The fastest bird is the Spine-tailed swift, clocked at speeds of up to 220 miles per hour.
The fastest moving land snail, the common garden snail, has a speed of 0.0313 mph.
The worlds most smallest octopus, the Blue Ring, is also the worlds most poisonous.
On average, 63 people each year in the UK die due to inhalation of animal hair.
Hummingbirds are so small that one of their predators is an insect, the praying mantis. Check out the photo: praying mantis serving dinner
Humming birds can fly up to 71 miles per hour. Penguins, emus, ostriches, cassowary, kiwi, kakapo (a parrot), rhea and ratites are all birds that do not fly.
The term "horsepower", is the unit of energy needed to lift 550lbs 1ft. in the air for 1 second by an average strength horse.
Hibernation is not a deep sleep but, an actual state of dormant existence that can last weeks even months for certain types of animals. The word hibernation came from the Latin word, "wintering".
The longest time spent in hibernation goes to the Burrowground squirrel with 9 months of hibernation.
Siamese fighting fish, also known as Betta Splendens, have a special respiratory organ that allows them to breath air directly from the surface.
There are two types of coral, hard coral and soft coral. Hard coral species appear in reefs while soft coral species do not build reefs.
The name anteater usually refers to the Giant Anteater but is also applied to the aardvark, the numbat, the echidna, and the pangolin. Together with the sloths, these animals comprise the order Pilosa. All these animals are known to eat ants and termites
The lowly krill averages only about two inches (5 centimeters) in length, but it represents a giant-sized link in the global food chain. These small, shrimp-like crustaceans are essentially the fuel that runs the engine of the Earth’s marine ecosystems.
"Mudpuppies, also called waterdogs, are one of only a few salamanders that make noise. They get their name from the somewhat embellished notion that their squeaky vocalizations sound like a dog's bark."- national geographic
In 2005, Ai Ai, a 27-year-old chimpanzee living at a zoo in northern China's Shaanxi province quit smoking after 16 years. Zoo keepers helped by providing therapy that included walking, music therapy, and exercise according to the Xinhua news agency said.
Male black widow spiders are half the size of the female or smaller. Female black widows can get as long as 55mm or 2.165 inches.
The polar bears live only in the Arctic at the North Pole and penguins live only in the Antarctic at the South Pole.
Scotland's national animal is the unicorn, a mythical creature that has appeared on Scottish royal coats of arms since the 1400s.
The Golden Retriever Lifetime Study, run by the Morris Animal Foundation, has followed more than 3,000 Golden Retrievers over their whole lives to understand why the breed has such high cancer rates. Cancer is the leading cause of death in Goldens.
German Shepherds are especially prone to hip and elbow dysplasia, an inherited joint problem. Responsible breeders screen parent dogs through organizations like the Orthopedic Foundation for Animals before breeding.
Dachshunds were bred with long bodies and short legs so they could dig into badger burrows and chase the animals underground. Their shape is basically a piece of hunting equipment, not just a cute design.
Beagles are the breed most commonly used in laboratory research because of their manageable size and gentle, easygoing temperament. This has led to many Beagle rescue and adoption efforts.
The AKC breed standard calls for Rottweilers to have docked (shortened) tails, a holdover from their working past. Many European countries now ban docking, so Rottweilers there usually keep their natural tails.
The Bulldog was originally bred in England for bull-baiting, a brutal blood sport. After England banned it with the Cruelty to Animals Act of 1835, breeders reshaped the Bulldog into the gentle companion it is today.
Because of welfare concerns, some places, including the Netherlands, restrict or ban breeding Scottish Folds.
The tiger is the largest cat species on Earth. Large male Amur (Siberian) tigers can weigh over 600 pounds, which makes them bigger than lions.
A tiger's stripes go deeper than its fur. Its skin is striped too, so a shaved tiger would still show its pattern.
No two tigers have the same stripe pattern, so researchers can identify individual wild tigers from camera trap photos almost like fingerprints.
A 2022 global estimate put the wild tiger population at around 5,500, a slight rebound after tiger numbers hit historic lows in the early 2000s.
India is home to roughly three-quarters of the world's wild tigers, more than 3,000 according to its most recent national census. The Bengal tiger is also India's national animal.
Conservation groups have estimated that about 5,000 tigers live in captivity in the US, many in private hands, which is roughly as many tigers as remain in the wild worldwide.
Unlike most cats, tigers love water. They are strong swimmers that often cool off in rivers and lakes and can even hunt in water.
A tiger's roar can be heard up to about two miles away, loud enough to warn rival tigers away from its territory.
Tigers have bright white spots on the backs of their ears, called ocelli. Scientists think they may help cubs follow their mothers or act like "fake eyes" to warn off threats from behind.
Tigers are solitary hunters that live and hunt alone, except for mothers raising cubs, which is very different from lions.
Lions are the only truly social big cats. They live in groups called prides, usually made up of related females, their cubs, and a few males.
In a lion pride, lionesses do most of the hunting and often work as a team to bring down large prey like zebras and wildebeest.
A lion's roar can be heard up to about five miles away, one of the loudest sounds made by any big cat.
Lions can sleep or rest up to 20 hours a day, saving their energy for short, intense bursts of hunting.
The only wild Asiatic lions left in the world live in and around Gir Forest in Gujarat, India, after the subspecies nearly went extinct in the early 1900s.
Only about 20,000 to 25,000 lions remain in the wild, and the species is listed as vulnerable because of habitat loss and conflict with people.
A darker lion mane is linked to higher testosterone and better health, and research found that female lions tend to prefer males with darker manes.
Cecil was a famous lion in Zimbabwe's Hwange National Park whose killing by an American trophy hunter in 2015 sparked worldwide outrage and debate about trophy hunting.
Lions once lived in parts of southeastern Europe, including ancient Greece, and Ice Age cave lions roamed across Europe tens of thousands of years ago.
Male lions can weigh around 400 pounds, and their manes make them look even bigger, which helps intimidate rivals.
The African savanna elephant is the largest land animal on Earth, and big males can weigh around six tons.
There are three living elephant species: the African savanna elephant, the African forest elephant, and the Asian elephant.
An elephant's trunk has tens of thousands of muscles and no bones, so it's strong enough to lift heavy logs and precise enough to pick up a single peanut.
Elephants have the longest pregnancy of any land mammal, about 22 months, so a mother elephant is pregnant for almost two years.
In a 2006 study, an Asian elephant named Happy at the Bronx Zoo recognized herself in a mirror. That puts elephants in a small club of animals that pass the mirror self-recognition test.
Elephants communicate with low rumbles called infrasound, which are too low for humans to hear and can travel for miles. They may even sense these vibrations through their feet.
Elephant herds are led by the oldest female, called the matriarch, whose memory of water sources and dangers can mean survival for the whole family.
The international trade in elephant ivory was banned under the CITES treaty in 1989 after poaching cut Africa's elephant population roughly in half during the 1980s.
Elephants have been observed lingering over and touching the bones of dead elephants, behavior that many scientists interpret as a form of mourning.
An adult elephant can eat a few hundred pounds of plants and drink up to around 50 gallons of water in a single day.
Bottlenose dolphins create unique "signature whistles" that work like names, and research shows they respond when they hear their own whistle copied.
Dolphins use echolocation, sending out clicks and listening to the echoes, to "see" prey and objects even in dark or murky water.
The orca, also called the killer whale, is actually the largest member of the dolphin family, not a true whale in the everyday sense.
Some bottlenose dolphins in Shark Bay, Australia, wear marine sponges on their snouts to protect them while digging for food. The habit is mostly passed from mothers to their offspring.
A 2001 study showed that bottlenose dolphins can recognize themselves in a mirror, a sign of self-awareness that very few animals have shown.
The US Navy's Marine Mammal Program has trained bottlenose dolphins to find underwater mines and objects using their natural echolocation.
The baiji, or Yangtze River dolphin, was declared functionally extinct after a 2006 survey failed to find any. It was the first dolphin species thought to be wiped out mainly by human activity.
The Amazon river dolphin, or boto, can turn bright pink, especially older males, and it lives in the freshwater rivers of South America.
Dolphins are mammals, not fish, so they breathe air through a blowhole on top of their heads and have to surface regularly to breathe.
Horses can doze standing up thanks to a "stay apparatus," a system of tendons and ligaments that locks their legs in place, but they need to lie down for deep REM sleep.
Horses have the largest eyes of any land mammal, and their side-placed eyes give them nearly 360-degree vision, with small blind spots directly in front and behind.
Horses basically can't vomit because of a strong muscle valve at the entrance to the stomach, which is why stomach problems like colic can become life-threatening for them.
The phrase "long in the tooth" comes from horses, whose gums recede as they age, making their teeth look longer. That's also why people check a horse's teeth to estimate its age.
A 2021 genetic study found that modern domestic horses trace back to the steppes of southern Russia about 4,200 years ago and then spread rapidly across Asia and Europe.
Horses first evolved in North America but died out there around 10,000 years ago, then returned when Spanish explorers brought them back in the 1500s.
Przewalski's horse is a rare, stocky horse from Mongolia, often called the last truly wild horse. It went extinct in the wild and was successfully reintroduced from zoo populations.
A Thoroughbred named Winning Brew set a Guinness World Record in 2008 by running about 44 miles per hour over a quarter mile, the fastest speed recorded for a racehorse.
Researchers identified 17 distinct facial movements in horses, more than they found in chimpanzees, which shows how expressive horse faces really are.
A horse's hoof is actually a single giant toe, the result of millions of years of evolution from small, multi-toed ancestors to a body built for running.
About 99% of a giant panda's diet is bamboo, and a panda may spend 10 to 16 hours a day eating it to get enough energy.
Even though they eat almost only bamboo, giant pandas have the digestive system of a carnivore, so they absorb only a small fraction of the plant's nutrients.
Giant pandas have a "pseudo-thumb," an enlarged wrist bone that works like an extra thumb to help them grip bamboo stalks.
In 2016, the IUCN downgraded the giant panda from endangered to vulnerable after decades of habitat protection helped wild numbers rise.
A newborn giant panda weighs only about 3 to 5 ounces, roughly 1/900th of its mother's weight, which makes it one of the smallest newborns relative to its mother of any mammal.
China has long loaned giant pandas to other countries as a diplomatic gesture. After President Nixon's 1972 visit to China, the pandas Ling-Ling and Hsing-Hsing were sent to the National Zoo in Washington, DC.
China's most recent national survey counted about 1,864 giant pandas living in the wild.
Research suggests the panda's black-and-white coloring helps it blend into both snowy and shady forest habitats, while its dark eye patches may help pandas recognize each other.
Wild giant pandas live only in the mountain forests of central China, mainly in Sichuan, Shaanxi, and Gansu provinces.
Scientists debated it for years, but DNA evidence confirmed that giant pandas are true bears, members of the same family as grizzlies and polar bears.
Gray wolves were reintroduced to Yellowstone National Park in 1995. Their return changed elk behavior and helped plants, beavers, and other wildlife recover, a chain reaction called a trophic cascade.
The idea of an aggressive "alpha wolf" came from studies of unrelated captive wolves. In the wild, most packs are just families led by the parents, and biologist David Mech, who popularized the term, later worked to correct it.
A wolf's howl can travel for miles across open terrain, helping pack members find each other and warning rival packs to stay away.
Domestic dogs descend from an ancient population of wolves that were domesticated by humans tens of thousands of years ago.
A hungry gray wolf can eat about 20 pounds of meat in a single meal, then go days without eating until the next kill.
OR-7 was a gray wolf from Oregon that traveled more than 1,000 miles and became the first wild wolf known in California since 1924 when he crossed the state line in 2011.
Wolves are built for endurance and can travel 30 miles or more in a single day while hunting or patrolling their territory.
The red wolf is one of the world's most endangered canines, and only a small population of fewer than about 30 survives in the wild in eastern North Carolina.
Wolf pups are born deaf and blind, and they depend completely on their mother and the rest of the pack for their first few weeks.
According to Roman legend, the twins Romulus and Remus were nursed by a she-wolf, and Romulus went on to found the city of Rome.
Sharks have been around for more than 400 million years, so they're older than trees, which appeared roughly 350 million years ago.
The Greenland shark is the longest-living vertebrate known. A 2016 study estimated one was at least 272 years old and possibly close to 400.
Sharks don't have bones. Their skeletons are made of cartilage, the same flexible material in human ears and noses, which makes them lighter and more flexible.
Sharks have special organs called ampullae of Lorenzini that detect the tiny electric fields produced by other animals' muscles, which helps them find hidden prey.
The whale shark is the largest fish in the world and can grow longer than 40 feet, but it feeds mostly on tiny plankton and is harmless to humans.
Some sharks, like great whites, must keep swimming to push water over their gills, but others, like nurse sharks, can rest on the seafloor and pump water over their gills instead.
A 2013 study estimated that humans kill about 100 million sharks each year, many for their fins, which has pushed many species toward extinction.
Sharks constantly replace lost teeth with new ones from rows behind them, and some sharks go through thousands of teeth in a lifetime.
Unprovoked shark bites on humans are rare, usually fewer than 100 per year worldwide, and only a handful are fatal. People are far more dangerous to sharks than sharks are to people.
Shark skin is covered in tiny tooth-like scales called dermal denticles, which reduce drag while swimming and feel like sandpaper if you rub them the wrong way.
The blue whale is the largest animal known to have ever lived. It can reach about 100 feet long and weigh around 200 tons, more than any dinosaur.
A blue whale's heart weighs about 400 pounds, roughly the size of a golf cart, according to scientists who preserved one in 2014.
Male humpback whales sing long, complex songs, likely to attract mates, and these songs change over time and can spread across entire ocean basins like a hit song.
Bowhead whales can live more than 200 years. Some have been found with old harpoon tips from the 1800s still lodged in their bodies.
The sperm whale has the largest brain of any animal on Earth, weighing around 17 pounds.
The International Whaling Commission put a worldwide moratorium on commercial whaling into effect in 1986 after many whale species had been hunted close to extinction.
Whales evolved from four-legged land mammals, and their closest living relative is the hippopotamus.
When a whale dies and sinks to the ocean floor, its body becomes a "whale fall" that can feed entire deep-sea ecosystems for decades.
The "52-hertz whale" is an unidentified whale that calls at an unusually high frequency other whales may not respond to, which earned it the nickname "the loneliest whale in the world."
Baleen whales filter food through baleen plates made of keratin, the same material as human fingernails and hair.
Male emperor penguins balance their eggs on their feet under a warm flap of skin for about two months in the Antarctic winter, eating nothing the entire time.
A penguin's black back and white belly are camouflage called countershading. From above it blends with the dark ocean, and from below it blends with the bright surface.
The gentoo penguin is the fastest-swimming bird, reaching speeds of about 22 miles per hour underwater.
Penguins have a special gland above their eyes that filters salt out of their blood, so they can drink seawater and then sneeze or shake out the extra salt.
There are about 18 species of penguins, ranging from the tiny little blue penguin to the emperor penguin, which can stand nearly four feet tall.
Emperor penguins can dive more than 1,600 feet deep and stay underwater for over 20 minutes, the deepest dives of any bird.
Some penguins, like gentoos and Adélies, collect pebbles to build their nests, and males may offer stones to females during courtship.
Sir Nils Olav, a king penguin at Edinburgh Zoo, is the mascot of Norway's King's Guard and has been knighted and promoted to the rank of brigadier.
Prehistoric penguins could be huge. Kumimanu fordycei, a fossil penguin from New Zealand, may have weighed over 300 pounds, more than three times as heavy as an emperor penguin.
Monkeys are split into Old World monkeys from Africa and Asia and New World monkeys from Central and South America, and only some New World monkeys have prehensile tails that can grab things.
Howler monkeys are among the loudest land animals, and their calls can be heard up to about three miles away through the forest.
The pygmy marmoset of South America is the world's smallest monkey and weighs only about 3 to 4 ounces as an adult.
The mandrill is the world's largest monkey and also one of the most colorful mammals, with a bright red and blue face.
Capuchin monkeys use stones to crack nuts, and archaeologists in Brazil found evidence that they've been doing it for at least 3,000 years.
Japanese macaques, known as snow monkeys, soak in natural hot springs during cold winters, and research suggests it helps lower their stress levels.
A rhesus monkey named Albert II became the first primate in space in 1949, when a US V-2 rocket carried him past the edge of space.
Apes like chimpanzees, gorillas, and orangutans aren't monkeys. One easy way to tell them apart is that apes don't have tails.
Vervet monkeys use different alarm calls for leopards, eagles, and snakes, and other vervets react to each call in the right way, like climbing trees or looking up.
The city of Lopburi, Thailand, holds an annual Monkey Buffet Festival where the local macaques are served huge piles of fruit and food.
Humans share about 98.7% of their DNA with chimpanzees and bonobos, which makes them our closest living relatives.
In 1960, Jane Goodall saw a chimpanzee she named David Greybeard using a grass stem to "fish" for termites, proving that humans weren't the only animals that make and use tools.
Chimpanzees can be violent. From 1974 to 1978, researchers at Gombe watched one chimp community wipe out a rival group in what's known as the Gombe Chimpanzee War.
A chimpanzee named Ham became the first great ape in space in 1961, helping NASA prove that humans could perform tasks during spaceflight.
Chimpanzees are stronger than humans, but not superhero-level. A 2017 study found their muscles are about 1.35 times as powerful as ours, much less than the "five times stronger" myth.
A chimpanzee named Washoe learned around 350 signs of American Sign Language, making her one of the first non-human animals taught to communicate with human signs.
A young chimpanzee named Ayumu outperformed human adults on a test that required memorizing the positions of numbers flashed on a screen for a split second.
Chimpanzees build a fresh sleeping nest in the trees almost every night by bending and weaving branches and leaves together.
Chimpanzees have been observed eating bitter plants that aren't part of their usual diet when they're sick, possibly to treat parasites, an example of animal self-medication.
Chimpanzees are listed as endangered because of habitat loss, poaching, and disease, and their wild numbers have declined sharply over the past century.
Snakes don't have eyelids. Instead, each eye is covered by a clear scale called a brille, which is why snakes can't blink and seem to stare.
Snakes flick their tongues to collect scent particles from the air and deliver them to the Jacobson's organ in the roof of the mouth, which basically lets them smell with their tongues.
Snakes don't literally unhinge their jaws. Their lower jaw bones aren't fused at the chin and are connected by stretchy ligaments, which lets them swallow prey much wider than their heads.
A reticulated python named Medusa from Kansas City holds the Guinness World Record for the longest snake ever in captivity, measuring about 25 feet long.
Based on venom strength in lab tests, the inland taipan of Australia is the most venomous land snake in the world, but it's shy and rarely bites people.
The World Health Organization estimates that snakebites kill between about 81,000 and 138,000 people every year, mostly in rural parts of Africa and Asia.
Legend says Saint Patrick drove the snakes out of Ireland, but scientists say snakes never got there after the last Ice Age because the island was cut off by the sea.
Some female snakes can reproduce without a male through parthenogenesis, or "virgin birth," which has been documented in species like boas and pythons.
Pit vipers, like rattlesnakes, have heat-sensing pits on their faces that detect infrared radiation, so they can "see" the body heat of warm prey in total darkness.
The brown tree snake was accidentally brought to Guam around WWII and wiped out most of the island's native forest birds, one of the worst invasive species disasters ever recorded.
Polar bears have black skin under their fur, and their fur isn't actually white but transparent and hollow, reflecting light so it looks white.
Hibernating black bears can go months without eating, drinking, urinating, or defecating, and their bodies recycle waste into protein.
The teddy bear is named after President Theodore Roosevelt, who refused to shoot a tied-up bear on a 1902 hunting trip, which inspired a cartoon and then a stuffed toy.
Bears have one of the best senses of smell of any animal, and grizzlies may be able to smell food from miles away.
Despite their size, grizzly bears can run about 35 miles per hour in short bursts, faster than any human sprinter.
Fat Bear Week is an online contest from Katmai National Park in Alaska where people vote for the brown bear that bulked up the most before winter hibernation.
The polar bear is the largest land carnivore, and big males can weigh well over 1,000 pounds.
There are eight living bear species: the American black bear, brown bear, polar bear, Asiatic black bear, sloth bear, sun bear, spectacled bear, and giant panda.
California's state flag features a grizzly bear, even though grizzlies were wiped out in the state, with the last confirmed sighting in the 1920s.
The sun bear of Southeast Asia is the smallest bear species and has an extremely long tongue for slurping honey and insects out of trees.
The Library of Congress owns one of only three perfect surviving copies of the Gutenberg Bible printed on vellum, a type of animal skin parchment.
Ancient Mesoamerican cultures made wheeled toys but never used wheels for practical transportation, possibly because they had no large draft animals to pull carts.
Some animals, including migrating birds and sea turtles, can sense Earth's magnetic field and use it like a built-in compass.
Bangkok's Lumpini Park is home to monitor lizards.
Avocados contain persin, which is toxic to birds.
Avocado pits are so big because they evolved to be spread by giant prehistoric animals.
Saint Francis of Assisi is the patron saint of animals and ecology.
Many churches hold blessings of animals on October 4, the feast of Saint Francis of Assisi.
"Animal Farm" was rejected by several publishers, including T.S. Eliot at Faber and Faber.
Didgeridoo players can imitate animal sounds.
Salvador Dalí had a pet ocelot named Babou.
Georgia O'Keeffe painted animal skulls and bones she found in the desert.
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
About two-thirds of an octopus's neurons are in its arms, so each arm can sense and react somewhat independently of the brain.
Octopuses can change their skin color and texture in a fraction of a second, even though scientists believe they're colorblind.
In 2016, an octopus named Inky escaped from the National Aquarium of New Zealand by squeezing through a gap in his tank and sliding down a drainpipe to the sea.
Octopuses have no bones, so they can squeeze through any opening larger than their hard beak.
The most widely accepted plural of "octopus" is "octopuses," since the word comes from Greek, not Latin.
The coconut octopus carries coconut shells around and uses them as portable shelters, one of the first known examples of tool use in invertebrates.
One deep-sea octopus was observed guarding her eggs for about 53 months, the longest brooding period known for any animal.
Octopus suckers have chemical sensors that let them taste what they touch.
The UK's 2022 Animal Welfare (Sentience) Act recognized octopuses as sentient beings.
There are seven species of sea turtles.
The temperature of the sand decides whether baby sea turtles hatch male or female. Warmer nests produce more females.
Female sea turtles often return to nest on the same beach where they hatched, possibly using Earth's magnetic field to navigate.
The leatherback is the largest sea turtle, and it feeds mainly on jellyfish.
Sea turtles can't pull their heads and flippers into their shells like land turtles can.
Sea turtles appear to cry because they release extra salt through glands near their eyes.
Only about 1 in 1,000 sea turtle hatchlings is estimated to survive to adulthood.
Traditional "tortoiseshell" products came from the shells of hawksbill sea turtles.
Archelon was a prehistoric sea turtle that grew to about 15 feet long.
A tracked leatherback sea turtle swam more than 12,000 miles across the Pacific.
Jellyfish have no brain, heart, or bones, and their bodies are about 95% water.
The "immortal jellyfish" can turn back into an earlier life stage when it's stressed, possibly letting it avoid dying of old age.
Jellyfish have existed for more than 500 million years, long before the dinosaurs.
Box jellyfish have 24 eyes.
The lion's mane jellyfish can have tentacles more than 100 feet long.
A group of jellyfish is called a "smack" or a "bloom."
Peeing on a jellyfish sting is a myth and can make it worse. Vinegar is recommended for some stings, like those from box jellyfish.
Jellyfish were sent to space aboard the Space Shuttle Columbia in 1991.
A glowing protein from the crystal jelly led to the 2008 Nobel Prize in Chemistry.
Jellyfish aren't fish, so some scientists prefer to call them "sea jellies."
Male seahorses give birth. The female deposits eggs into the male's pouch, and he carries them until they hatch.
The dwarf seahorse is considered the slowest fish, moving about five feet per hour.
Seahorses can move each eye independently.
Seahorses have no stomach, so they need to eat almost constantly.
Seahorses use their tails to grab onto seagrass and coral.
Some seahorse couples greet each other with a daily dance.
The seahorse's genus name, Hippocampus, is also the name of a part of the brain, because of its similar shape.
Pygmy seahorses are so well camouflaged on sea fans that they're nearly invisible.
International trade in seahorses has been regulated by CITES since 2004.
Seahorses can beat their small fins up to about 50 times per second.
Orcas are apex predators with no natural predators.
Different orca pods have their own dialects of calls.
In some orca populations, sons stay with their mothers for life.
Orcas are one of the few species besides humans known to go through menopause.
In 2018, an orca named Tahlequah carried her dead calf for 17 days in the Pacific Northwest.
Since 2020, orcas off Spain and Portugal have been interacting with sailboats and damaging their rudders.
The Southern Resident orcas of the Pacific Northwest are endangered, with fewer than 80 left.
Orcas off South Africa have been seen hunting great white sharks.
Keiko, the orca from "Free Willy," lived at the Oregon Coast Aquarium before being released near Iceland.
A male orca's dorsal fin can be up to six feet tall.
Sea otters have the densest fur of any animal, up to about a million hairs per square inch.
Sea otters sometimes hold hands while sleeping so they don't drift apart.
Sea otters use rocks to crack open shellfish and may keep a favorite rock in a pouch under their arm.
Sea otters eat sea urchins, which keeps urchins from destroying kelp forests.
The fur trade nearly wiped out sea otters, leaving only about 1,000 to 2,000 by the early 1900s.
Sea otters eat about 25% of their body weight every day.
Unlike most marine mammals, sea otters have no blubber.
The sea otter is the smallest marine mammal.
The Monterey Bay Aquarium pairs orphaned sea otter pups with surrogate mothers.
A sea otter known as Otter 841 became famous in 2023 for stealing surfboards in Santa Cruz, California.
Manta rays have one of the largest brain-to-body ratios of any fish.
A 2016 study suggested manta rays may recognize themselves in a mirror.
Giant manta rays can have wingspans of more than 20 feet.
Manta rays are filter feeders and don't have stingers.
Each manta ray has a unique pattern of spots on its belly.
Manta rays can leap out of the water, which is called breaching.
Manta rays are threatened by hunting for their gill plates.
Manta rays visit "cleaning stations" where small fish eat parasites off them.
Manta rays are pregnant for about a year and usually give birth to one pup.
"Manta" means "blanket" in Spanish.
Clownfish are protected from anemone stings by a special mucus coating.
All clownfish are born male, and the dominant one in a group can become female.
"Finding Nemo" increased demand for clownfish as pets.
There are about 30 species of clownfish.
Clownfish live in groups with a strict size-based hierarchy.
Male clownfish guard the eggs.
Clownfish are commonly bred in captivity.
Clownfish make popping and clicking sounds.
Clownfish and anemones help each other in a mutualistic relationship.
Clownfish develop their stripes as they mature.
Starfish aren't fish, so scientists prefer to call them sea stars.
Sea stars can regrow lost arms, and some can regrow a whole body from a single arm.
Sea stars have a simple eye at the tip of each arm.
Sea stars push their stomachs out of their bodies to eat.
Sea stars have no blood and use seawater to move nutrients through their bodies.
Sea star wasting disease, which began in 2013, killed billions of sea stars along the Pacific coast.
There are about 2,000 species of sea stars.
Sea stars move using hundreds of tiny tube feet.
The crown-of-thorns starfish eats coral and can damage reefs.
Some sea stars, like the sunflower sea star, can have more than 20 arms.
A live giant squid was photographed in the wild for the first time in 2004 and filmed in 2012.
Giant and colossal squid have the largest eyes in the animal kingdom, about the size of a dinner plate.
Giant squid can grow to about 40 feet long.
Sperm whales eat giant squid and often have sucker scars from fighting them.
The giant squid may have inspired the legend of the Kraken.
A colossal squid was filmed alive in the wild for the first time in 2025.
Squid have hard beaks.
A squid's brain is shaped like a doughnut, and its esophagus passes through the middle.
The Smithsonian has a giant squid on display.
Giant squid stay buoyant using ammonia in their tissues.
A narwhal's tusk is actually a tooth that grows through its upper lip, and it's usually found on males.
A narwhal's tusk may contain millions of nerve endings.
In medieval times, narwhal tusks were sold as unicorn horns.
Denmark's Throne Chair is made largely of narwhal tusk.
Narwhals live in the Arctic.
Narwhals don't survive well in captivity.
"Narwhal" comes from an Old Norse word meaning "corpse whale."
Rarely, a narwhal grows two tusks.
Narwhals do most of their eating in winter.
Drone footage from 2017 showed narwhals using their tusks to stun fish.
The manatee's closest living relatives are elephants.
Christopher Columbus reported seeing "mermaids" in 1493 that were probably manatees.
The manatee is Florida's official state marine mammal.
Scientists identify individual manatees by scars from boat propellers.
Manatees eat about 10% to 15% of their body weight every day.
Manatees gather near power plants in winter for the warm water.
Manatees constantly replace their teeth, which move forward in a process called "marching molars."
Manatees are called "sea cows" because they graze on plants.
Manatees were reclassified from endangered to threatened in 2017.
Resting manatees can hold their breath for up to about 20 minutes.
A sea cucumber isn't a plant. It's a sea animal.
Nikola Tesla was devoted to pigeons and fed them in New York City.
Aristotle described and classified hundreds of animal species and is often called the father of biology.
Aristotle described humans as political animals.
Alan Turing wrote a paper explaining how patterns like stripes and spots form in nature.
At Cambridge, Charles Darwin belonged to the Glutton Club, which ate unusual animals.
The Suez Canal allowed sea animals to move between the Red Sea and the Mediterranean.
Ancient Mesoamerican cultures made wheeled toys, but never used wheels for transportation, likely because they had no large animals to pull carts.
The Aztec ruler Moctezuma kept a large zoo.
Fish skin, usually from Atlantic cod or Nile tilapia, has anti-inflammatory and anti-bacterial properties that support healing of some wounds including burns and diabetic foot ulcers.
Early insulin was made from the pancreases of cows and pigs.
Some of the first blood transfusions, in the 1660s, used blood from animals like lambs.