A group of kittens is called a "kindle".
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Dolphins have names for one another.
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One litter of kittens can be produced by more than one father.
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A group of pugs is called a grumble.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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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.
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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.
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