A 400-pound wall of pure muscle wrapped in a surprisingly gentle soul—until you threaten its family. The silverback gorilla can bench-press an estimated 1,800 pounds and possesses grip strength capable of crushing a crocodile's skull with its bare hands. Pound for pound one of the strongest animals on Earth, and smart enough to learn sign language while doing it.

The 40-foot, 9-ton apex predator that ruled the Cretaceous period with the strongest bite force ever measured in a terrestrial animal—12,800 pounds of bone-crushing fury. Its banana-sized teeth could pulverize anything that walked, ran, or made the fatal mistake of existing nearby. Sixty-six million years of extinction haven't diminished its reputation one bit.