T. rex’s incredible biting force came from its stiff lower jaw
A small bone in the mandible helped brace an otherwise flexible joint
![head of T. rex fossil](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/05/050321_SP_dino-bite_feat.jpg?fit=1030%2C580&ssl=1)
The jaws of a T. rex, such as this one displayed at the Natural History Museum of Leiden, could generate bone-crushing forces thanks to a particular bone near the rear of its mandible.
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