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
Cats recognise the voice of their owner, but never evolved to care.
22
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
The reindeer is the only mammal that can see UV light.
17
Penguins have a gland above their eye that turns saltwater into freshwater.
12