Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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Whales and dolphins can't taste anything other than salt.
11
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Cats recognise the voice of their owner, but never evolved to care.
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