Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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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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Rex the German Shepherd was a rescue dog with a bad temper. He refused to be fed by humans and would attack strangers, but he’s a changed dog after falling in love with Geraldine the goose!
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The male seahorse carries babies and 'gives birth' to them instead of the female.
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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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In order to enhance the taste, Japanese macaque wash their food in salt water before they eat. They also make snowballs for fun!
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