An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
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
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9