Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
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
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The reindeer is the only mammal that can see UV light.
17
The cat brain weighs about 30g.
167