Christophe Courteau / Fighting between a pack of 21 African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaenas (Crocuta crocuta) Northern Okavango Delta, Botswana

Christophe Courteau / Fighting between a pack of 21 African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaenas (Crocuta crocuta) Northern Okavango Delta, Botswana

Martin Dohrn / Group of hyena (Crocuta crocuta) playing in deep rain puddle at night. Topi Plain, Masai Mara, Kenya. Image taken using "starlight camera" with no artificial light, on location for National Geographi...

Christophe Courteau / Pride of African lions (Panthera leo) with a kill at night time, watched by Brown hyaenas (Hyaena brunnea). The Dominant Lioness is defending the clan and faces the Hyaenas. Botswana

Christophe Courteau / Fighting between a pack of 21 African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaenas (Crocuta crocuta) Northern Okavango Delta, Botswana

Christophe Courteau / Fighting between a pack of 21 African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaena (Crocuta crocuta) Northern Okavango Delta, Botswana

Christophe Courteau / Fighting between a pack of 21 African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaenas (Crocuta crocuta) Northern Okavango Delta, Botswana

Christophe Courteau / Fighting between a pack of African Wild Dogs {Lycaon pictus} and the dominant female of a clan of Spotted Hyaenas (Crocuta crocuta) Northern Okavango Delta, Botswana

Charlie Summers / Tlingit (Southeast Alaskan Native American) carving on the side of the Clan House. Bight Totem State Park, Ketchikan, Alaska, July 2011.

Suzi Eszterhas / Spotted Hyena (Crocuta crocuta) six week old cub sniffing the phallus of clan member in greeting ceremony, Masai Mara Conservancy, Kenya

Juergen Freund / Neckbone of Dugong (Dugong dugong) used in Palau as bracelet for clan chiefs, Palau, Micronesia

Eric Baccega / A Korowai clan crossing a river to join the sago celebration, Western Papuasia, Indonesia. 1999 / 2000. (West Papua).

Anup Shah / Spotted hyaena chasing off rival clan, Masai Mara NR Kenya