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

Eric Baccega / Spotted hyena (Crocuta crocuta) clan feeding on dead young Eastern white-bearded wildebeest (Connochaetes taurinus) whilst defending it from White backed vultures (Gyps africanus) and Rupell's vulture...

Tony Wu / Large gathering of sperm whales (Physeter macrocephalus) comprising hundreds, perhaps thousands of individual whales that spanned horizon to horizon for nearly three days. This was likely a meeting of...