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Optimal and maximal jaw gapes for three dinosaurs in a new study, Allosaurus fragilis (L), Tyrannosaurus rex (C) and Erlikosaurus andrewsi, are seen in an undated handout illustration courtesy of paleontologist Stephan Lautenschlager of the University of Bristol in Britain. A new study analyzing dinosaur jaw musculature found that Allosaurus, a fearsome hunter that prowled North America about 150 million years ago, was able to crank open its jaws between 79 and 92 degrees, wider than a right angle. (Photo by Stephan Lautenschlager/Reuters/University of Bristol)
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