Ingo Arndt / Topi (Damaliscus lunatus) herd with guard standing on termite mound, Masai Mara National Reserve, Kenya

Ingo Arndt / Topi (Damaliscus lunatus) walking, Masai Mara National Reserve, Kenya

Ingo Arndt / Topi (Damaliscus lunatus) pair standing on mound, Masai Mara National Reserve, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) mother and young calf, Masai Mara, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) mother and less than 2 days old foal nursing, Masai Mara, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) mother and less than 3 days old foal, Masai Mara, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) crossing Mara River, Masai Mara, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) herd, Masai Mara, Kenya

Suzi Eszterhas / Topi (Damaliscus lunatus) males sparring, Masai Mara, Kenya

Mitsuaki Iwago / Topi (Damaliscus lunatus) pair with Burchell's Zebra (Equus burchellii) and Giraffes (Giraffa camelopardalis), Serengeti National Park, Tanzania

Richard Du Toit / Topi (Damaliscus lunatus) mother and young, Savuti, Chobe National Park, Botswana

Anup Shah / Topi with calf {Damaliscus korrigum} Masai Mara reserve, Kenya