How could the T. rex crush skulls?

Dino, rex

Scientist used 3D modelling to discover how the Tyrannosaurus rex could crush the bones of it’s prey without hurting itself.

The Tyrannosaurus rex was a formidable predator. The ability of the T. rex to shatter the bones of it’s prey without breaking it’s own skull has been a long standing mystery for palaeontologists. New research from the University of Missouri suggests an answer to this age-old question.

Scientists now argue that the skull of T. rex was stiff, like that of a crocodile, allowing it do crush the bones of it’s prey without damaging itself.

“The T. rex had a skull that’s 6 feet long, 5 feet wide and 4 feet high, and bites with the force of about 6 tons,” said Kaleb Sellers, a graduate student in the MU School of Medicine. “Previous researchers looked at this from a bone-only perspective without taking into account all of the connections — ligaments and cartilage — that really mediate the interactions between the bones.”

“Dinosaurs are like modern-day birds, crocodiles and lizards in that they inherited particular joints in their skulls from fish — ball and socket joints, much like people’s hip joints — that seem to lend themselves, but not always, to movement like in snakes,” said Casey Holliday, an associate professor of anatomy in the MU School of Medicine. “When you put a lot of force on things, there’s a tradeoff between movement and stability. Birds and lizards have more movement but less stability. When we applied their individual movements to the T. rex skull, we saw it did not like being wiggled in ways that the lizard and bird skulls do, which suggests more stiffness.”

“In humans, this can also be applied to how people’s jaws work, such as studying how the jaw joint is loaded by stresses and strains during chewing,” said Ian Cost, the lead researcher on the study. Cost is an assistant professor at Albright College and a former doctoral student in the MU School of Medicine. “In animals, understanding how those movements occur and joints are loaded will, for instance, help veterinarians better understand how to treat exotic animals such as parrots, which suffer from arthritis in their faces.”


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