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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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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A new born kangaroo is small enough to fit in a spoon!
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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