Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
The reindeer is the only mammal that can see UV light.
17
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
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Penguins have a gland above their eye that turns saltwater into freshwater.
12