Jaws
With a device known as a gnathodynamometer (literally "jaw power meter"),
scientists can gauge the strength of shark jaws. The maximum force so far
recorded as applied to a single tooth was 132 pounds, which converts to
a tooth-tip pressure of 42,674 pounds per square inch. (This came from a shark
only six and a half feet long.) As if force were not enough, a shark's upper
and lower jaws can work independently and in opposition to each other—imagine a combination saw and scissors and you'll about have it.
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