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
Sharks, like other fish, have their reproductive organs in their chests.
248
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Alligators can live up to 100 years.
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