Cats recognise the voice of their owner, but never evolved to care.
22
Dogs have been man's pet for over 14,000 years.
224
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
There are approximately three chickens for every human on Earth.
13
Macaques monkeys in Japan learned to steal purses and wallets, take out the coins, and use them to buy drinks and snacks from vending machines.
26
When a male honey bee climaxes during sex, his testicles explode and then he dies.
27