The large muscles that connect the lower jaw to the crest at the top of the skull in all robust australopithecines is likely connected to their diet.

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The large muscles that connect the lower jaw to the crest at the top of the skull in robust australopithecines are known as the sagittal crest. This adaptation is believed to be related to their tough and fibrous diet, which required strong chewing muscles to break down the food.

The Large Muscles That Connect the Lower Jaw to the Crest