Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Cows can sleep standing up, but they can only dream lying down.
745
There are approximately three chickens for every human on Earth.
13
The elephant shrew’s closest relative isn’t a shrew — it’s actually an elephant
9
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
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9