Cats recognise the voice of their owner, but never evolved to care.
22
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
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
There's a rare breed of pig that looks like a sheep.
14