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.
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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
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