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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- Which fish has the largest brain for its body size?
“Manta rays have one of the largest brain-to-body ratios of any fish.”
Reference: Smithsonian Ocean
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Can manta rays recognize themselves?
A 2016 study suggested manta rays may recognize themselves in a mirror.
Which breed ranked second in Stanley Coren's dog intelligence rankings?
In psychologist Stanley Coren's 1994 book "The Intelligence of Dogs," the Poodle ranked as the second-smartest breed, behind only the Border Collie.