Honey badger (Mellivora capensis)

Honey badgers are not the strongest animals in the world in terms of size or pure force. They weigh just 30 pounds and have an 11-inch shoulder height. However, these temperamental animals are unafraid to take on larger animals, including lions. 

They eat honey, berries, vegetables, monkeys, and poisonous snakes. Their skin is both thick and loose. The thickness protects them from predator bites and bee stings, while the looseness allows them to twist their way out of a predator's grip.

The honey badger is possibly the toughest animal in the world. It is largely resistant to snake venom.