 Males defend their group 's territory , 25 – 100 hectares ( 62 – 247 acres ) large ; female members may also show some aggression and drive away intruders . A study showed that the number of females that visit the male 's territory depends on the appearance ( particularly the symmetry ) of the male 's horns . Males mark vegetation and soil in their territories by preorbital gland secretions and excrement ; the intensity of marking increases with the number of male neighbours . Dominant males tend to have greater access to females in and around the territory than other males . An important feature of the social behaviour of oribi is the " dung ceremony " , in which all animals form temporary dung middens . Oribi at least three months old have been observed giving out one to three alarm whistles on sensing danger . These whistles are more common in adults than in juveniles , and males appear to whistle more . Common predators include carnivorans such as jackals . 
 Males defend their group <a href='null_genetive' title='1'><mark>'s</mark></a>territory , 25 – 100 hectares ( 62 – 247 acres ) large ; female members may also show some aggression and drive away intruders . A study showed that the number of females <a href='null_relcl' title='2'><mark>that</mark></a>visit the male <a href='null_genetive' title='3'><mark>'s</mark></a>territory <a href='uninflect' title='4'><mark>depends</mark></a> on the appearance ( particularly the symmetry ) of the male <a href='null_genetive' title='5'><mark>'s</mark></a>horns . Males mark vegetation and soil in their territories by preorbital gland secretions and excrement ; the intensity of marking increases with the number of male neighbours . Dominant males tend to have greater access to females in and around the territory than other males . An important feature of the social behaviour of oribi <a href='drop_aux' title='6'><mark>is</mark></a>the " dung ceremony " , in which all animals form temporary dung middens . Oribi at least three months old <a href='been_done' title='7'><mark>have</mark></a> been observed giving out one to three alarm whistles on sensing danger . These whistles <a href='drop_aux' title='8'><mark>are</mark></a>more common in adults than in juveniles , and males appear to whistle more . Common predators include carnivorans such as jackals . 
Males defend their group  territory , 25 – 100 hectares ( 62 – 247 acres ) large ; female members may also show sum aggression and drive away intruders . A study showed that the number of females visit the male  territory depend on the appearance ( particularly the symmetry ) of the male  horns . Males mark vegetation and soil in their territories by preorbital gland secretions and excrement ; the intensity of marking increases w/ da number of male neighbours . Dominant males tend to have greater access to females in and around tdaterritory than other males . An important feature of the social behaviour of oribi thda dung ceremony " , in which all animals form temporary dung middens . Oribi at least three months old done been observed givin out one to three alarm whistles on sensing danger . These whistles more common in adults than in juveniles , and males appear to whistle more . Common predators include carnivorans such as jackals .