| brow ridges | Heavy, bony ridges over the eyes.
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| competitive exclusion | When one species outcompetes others for the resources of a particular area.
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| core tools | Tools made by taking flakes off a stone nucleus. See also flake tools.
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| flake tools | Tools made from the flakes removed from a stone core. See also core tools.
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| foramen magnum | The hole in the base of the skull through which the spinal cord emerges and around the outside of which the top vertebra articulates.
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| knuckle walking | Walking on the backs of the knuckles of the hand, typical of the African apes.
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| Oldowan | A toolmaking tradition from Africa associated with early Homo.
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| prognathism | The jutting forward of the lower face and jaw area.
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| sagittal crest | A ridge of bone, running from front to back along the top of the skull, for the attachment of chewing muscles.
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2002 McGraw-Hill Higher Education