How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- Were sea otters almost wiped out?
“The fur trade nearly wiped out sea otters, leaving only about 1,000 to 2,000 by the early 1900s.”
Reference: US Fish and Wildlife Service
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Which animal has the densest fur?
Sea otters have the densest fur of any animal, up to about a million hairs per square inch.
Do any two tigers have the same stripes?
No two tigers have the same stripe pattern, so researchers can identify individual wild tigers from camera trap photos almost like fingerprints.