Cat families usually play best in even numbers. Cats and kittens should be acquired in pairs whenever possible!
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Cats recognise the voice of their owner, but never evolved to care.
22
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
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25