Prehistoric "Jaws"

The mouth of Dunkleosteus terrelli. The fish is believed to have grown up to 30 feet in length.
Image: BBC

The Royal Society's journal, Biology Letters, reports that the extinct fish Dunkleosteus terrelli had a bite strength of 1,100 pounds. This power surpasses any other known species of fish, including the great white shark. By comparison, T. rex measured some 3,000 pounds of bite strength. Researchers constructed a model of Dunkleosteus terrelli from fossil remains. Because of the structure of the jaw, pressure could be focused onto the fang tip with an impressive intensity of 22,000 pounds per square inch. This fish lived during the Devonian Period, some 415 to 360 million years ago.

--BBC has more information