A single Nile crocodile bite closes with roughly 3,700 pounds of force per square inch, more than any measured living animal, yet the muscles that open the same jaw are so weak an adult can hold them shut with two hands

A Nile crocodile's bite closes with about 3,700 PSI — the strongest bite force ever measured in a living animal — yet the muscles that open the same jaw are so weak an adult can hold them shut by hand. That asymmetry is 100 million years of evolutionary logic.