Cats recognise the voice of their owner, but never evolved to care.
22
The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog. They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
17
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13