A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
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!)
11
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
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The largest earthworm on record was found in South Africa and measured 22 feet.
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