"Australopithecus" and "Paranthropus" also looked very different from each other. These differences were only found in remains of the skull. The other parts of the skeleton were still very similar, so it is reasonable to think the difference was an adaptation to different food. "Paranthropus" was more massively built as to skull and teeth. It often had gorilla-like sagittal crests on the cranium which anchored massive temporalis muscles for chewing.