Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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Lurch, a Watusi bull, had the largest horns in the world.
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The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog. They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
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There's a lizard known as the 'Jesus Lizard' that can run across water.
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Parrot parents "name" their children with a signature call.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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