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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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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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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The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
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The elephant brain weighs about 6,000g.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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