 The oribi is diurnal ( active mainly during the day ) , though some activity may also be observed at night . The animal rests in cover during rain events . Unlike all other small antelopes , oribi can exhibit three types of mating systems , depending on the habitat – polyandry , polygyny and polygynandry ; polygyny tends to prevail as the female @-@ to @-@ male ratio increases . A study suggested that polygyny is preferred in areas of high predator risk , as it leads to formation of groups as an anti @-@ predator measure . Small herds of up to four members are also common . 
 The oribi <a href='drop_aux' title='1'><mark>is</mark></a>diurnal ( active mainly during the day ) , though some activity may also be observed at night . The animal <a href='uninflect' title='2'><mark>rests</mark></a> in cover during rain events . Unlike all other small antelopes , oribi can exhibit three types of mating systems , depending on the habitat – polyandry , polygyny and polygynandry ; polygyny <a href='uninflect' title='3'><mark>tends</mark></a> to prevail as the female @-@ to @-@ male ratio increases . A study suggested that polygyny is preferred in areas of high predator risk , as it <a href='uninflect' title='4'><mark>leads</mark></a> to formation of groups as an anti @-@ predator measure . Small herds of up to four members <a href='drop_aux' title='5'><mark>are</mark></a>also common . 
Da oribi diurnal ( active mainly during tdaday ) , though sum activity may also be observed at nite . The animal rest in cover durin rain events . Unlike all other small antelopes , oribi can exhibit three types of mating systems , depending on the habitat – polyandry , polygyny and polygynandry ; polygyny tend to prevail as the female @-@ to @-@ male ratio increases . A study suggested dat polygyny is preferred in areas of high predator risk , as it lead to formation of groups as an anti @-@ predator measure . Small herds of up to four members also common .