 These same senses play an important role in contact between individuals of the same species; markings on their heads, ears, legs, and rumps are used in such communication.Many species "flash" such markings, as well as their tails; vocal communications include loud barks, whistles, "moos", and trumpeting; many species also use scent marking to define their territories or simply to maintain contact with their relatives and neighbors.Many antelope are sexually dimorphic.