ʻO ka ʻili hipa ka ʻili o kahi kao a hipa paha o ka ʻohana Bovidae. ʻO ka ʻili kao a i ʻole ka ʻili hipa ka wai, ka protein, ka momona a me nā mea inorganic, ʻo nā mea hope ʻelua he liʻiliʻi loa, ʻo ka ʻāpana protein o ka papa epidermis ka nui o keratin; Dermis, ka nui. ʻO ka collagen a me ka ʻupena paʻakikī paʻakikī, ʻo ia hoʻi, loaʻa i nā protein paʻakikī elastic, albumin, globulin a me mucin.