The king of the tyrant lizards, also known as Tyrannosaurus Rex, had the strongest bite of any known land animal, new research suggests.
For years, researchers have argued over whether T- Rex was more a scavenger or a hunter. Those who suggest it was a thief point at its puny arms, useless for hunting, as well as what seems to have been a sensitive nose, helpful for tracking down rotting corpses. Those who claim it was a killer cite its powerful bite and impact-resistant teeth.
In an attempt to resolve the controversy once and for all, researchers created a computer model of the dinosaur’s jaw by first digitally scanning skulls from an adult and juvenile T- Rex, an Allosaurus, an alligator and an adult human. They used these scans to model each animal’s bite. Researchers then used the computer model to produce a bite so that they could measure the speed and force of it directly.
The new estimates of bite force was higher than past estimates that relied on indent measures in which they pressed down the skull and teeth onto a bone until they got the imprints that matched those on fossils.
The force exerted at one of T- Rex‘s back teeth would have been between 7,868 and 12,814 pounds-force (35,000 and 57,000 newtons). This force would be akin to having a medium-size elephant sit on you.
Younger T- Rexes didn’t have such strong bites, the researchers found, which probably meant they had a different diet and relied less on the fearsome bite than their older counterparts. This differing diet likely led to reduced competition between generations of T- Rex, the researchers said.
The shape of T. Rex‘s skull allowed room for lots of muscles, creating what is “by far the highest bite forces estimated for any terrestrial animal,” the researchers write in the paper in the journal Biology Letters, but it is possible the extinct gigantic shark Megalodon had a stronger bite.


