16. The Nile Crocodile
The Nile crocodile (Crocodylus niloticus) boasts the most powerful bite force ever accurately measured in the modern animal kingdom, clamping down on its prey with a staggering 5,000 pounds per square inch (PSI) of pressure. To achieve this bone-crushing, inescapable power, the crocodile’s jaw anatomy has been highly modified by evolution; an extraordinarily massive portion of its skull is dedicated entirely to housing oversized, rock-hard adductor muscles. Additionally, they possess a unique secondary jaw joint that effectively spreads the immense mechanical stress across the solid bone of the skull, preventing their own jaws from shattering when they violently crush the femur of a wildebeest or zebra. Interestingly, while the muscles that snap the jaw shut are a marvel of biomechanical power, the muscles used to open the jaw are incredibly weak, meaning a human can easily hold a crocodile’s mouth shut with their bare hands or a simple strip of duct tape.
