Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When cats are happy, they may squeeze their eyes shut.
10
Dolphins have names for one another.
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There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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