The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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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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A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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