The crest along the top of the skull where the chewing muscles are attached, found only in very large-jawed species. In primates that have large jaws and well-developed chewing muscles (e.g., gorillas, orangutans, and baboons), the parietal bones may be continued upward at the midline to form a sagittal crest. Among early hominids, Paranthropus (also called Australopithecus robustus) sometimes exhibited a sagittal crest.