Cows can sleep standing up, but they can only dream lying down.
745
When cats are happy, they may squeeze their eyes shut.
10
Cats recognise the voice of their owner, but never evolved to care.
22
Worker bees must visit around 4,000 flowers in order to make one tablespoon of honey.
5
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
The head of a jellyfish is called the "Bell."
6