Male black grouse (Lyrurus tetrix) fighting on snow covered field, Finland

White-backed vulture (Gyps africanus) dominance display, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

Adult bull southern elephant seal (Mirounga leonina) fleeing from another male challenger at Gold Harbour, South Georgia, Polar Regions

An adult polar bear (Ursus maritimus) guarding a caribou kill in Holmabukta in the Svalbard Archipelago, Norway

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Brown Herefordshire bull and fresian cow in mating process in meadow in Gloucestershire

Native American Indian, Richmond, Virginia, United States of America

Cheetas scent marking their territory, Moremi, Botswana, Southern Africa

Zanzibar Red Colobus monkey, one of Africa's rarest primates

Olive Baboon glaring at Vervet Monkey (Green Monkey), Grumeti, Tanzania

Lion. Panthera leo. Male sniffing the air. Botswana

Lion. Panthera leo. Male portrait. Botswana

Lion. Panthera leo. Male portrait. Botswana

Lion. Panthera leo. Male portrait. Botswana

Lion. Panthera leo. Male portrait. Botswana

Two male lions (Panthera leo), son and father fighting for dominance, Masai Mara, Narok County, Kenya, Africa

Dall's sheep (ovis dalli) rams hitting heads together during dominance display, butting heads, in autumn, denali national park, Alaska, united states of america

Grey Wolves (Canis Lupus) Demonstrating Hierarchy, Montebello, Quebec, Canada

Panorama of African bush elephants (Loxodonta africana) standing in the water playing with each other with their trunks and tusks, face to face, in Chobe National Park, Chobe, North-West, Botswana

Two bull moose (Alces americanus) fight on a snowy forest road during the rut, Gaspesie National Park; Quebec, Canada