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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Dolphins have names for one another.
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A group of kittens is called a "kindle".
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