The colloquial names of species ending in "-nosed" refer to the rhinarium of the primate. The bare skin of the rhinarium is black. Its muzzle is short with a fawn coloured mouth, short whiskers and a naked rhinarium. The head is wide and flat with a blunt muzzle and broad rhinarium. Most commonly, the defect involves the lip, rhinarium, and premaxilla. The animal gets its name from the hairs that cover its rhinarium. Its skull is short, and the naked rhinarium rounded above. Its rhinarium is covered with short hair. In many animals, the form and purpose of the rhinarium remains unclear. As a result, the snout became reduced and the rhinarium or "wet nose" was lost. In place of the rhinarium, Haplorhini have a more mobile, continuous, dry upper lip. The rhinarium continues down where it divides the upper lip. In elephants, the rhinarium has become a tactile organ. The rhinarium is bare, with an obtuse, triangular projection. The rhinarium is often associated with a stronger sense of olfaction.