black male sable antelope drinking from the chobe river in chobe national park in botswana, africa.

black male sable antelope drinking chobe river national park botswana africa yellow-billed oxpecker back oxpeckers perch large mammals eating ticks small insects botfly larvae parasites animals blood antelopes form herds females calves led single called bull threatened predators including lions confront attackers fight-back aggressively scimitar-shaped horns reach vulnerable rump area impale enemy binomial name hippotragus niger photographed safari boat historic game lodge