"Paranthropus" is characterised by robust skulls, with a prominent gorilla-like sagittal crest along the midline–which suggest strong chewing muscles–and broad, herbivorous teeth used for grinding. However, they likely preferred soft food over tough and hard food. "Paranthropus" species were generalist feeders, but "P. robustus" was likely an omnivore, whereas "P. boisei" was likely herbivorous and mainly ate bulbotubers. They were bipeds. Despite their robust heads, they had comparatively small bodies. Average weight and height are estimated to be at for "P. robustus" males, at for "P. boisei" males, at for "P. robustus" females, and at for "P. boisei" females.