Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) on the lookout for challenges from younger males in the bachelor group, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) in aggressive display to other males, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) has a pendulous nose that covers the mouth and is attractive to females, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Rothschild's giraffe (Giraffa camelopardalis rothschildi), breeding dominant male, Woburn Safari Park, England, United Kingdom, Europe

Dominant male Indian Tiger (Bengal tiger) (Panthera tigris tigris), Bandhavgarh National Park, Madhya Pradesh state, India, Asia

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

Mustangs fighting in the Red Centre, Northern Territory, Australia

Newars, the dominant clan of Kathmandu Valley, playing traditional music. Bhaktapur, Nepal

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

western king wrasse (coris auricularis), male, dark pink colour with reddish-brown band running around boby and blue-green colouration over the head, wild, day, marine protected area, diving off Rottnest Island, reef edges, sand, seagrass, Western Australia, Indian Ocean. MORE INFO: social structure where dominant male, usually the biggest in the area, will have a harem of females. When the male dies or is absent for any length of time the largest female will change sex and dominate the group.

A male baboon in Kenya, East Africa, Africa

Dominant bull moose standing on a lakeshore during the rut and watching. Alces americanus

Male caribou in the snow, near Watson Lake, Yukon

Male caribou sparring in the snow, near Watson Lake, Yukon

Male worker hand labelling the bottles at the River Antoine rum distillery, Caribbean

Man reading the Koran, Bangladesh, Asia

Gelada or Gelada baboon (Theropithecus gelada), dominant male, Debre Libanos, Rift Valley, Ethiopia, Africa

Gelada or Gelada baboon (Theropithecus gelada), dominant male, grooming with a female, Debre Libanos, Rift Valley, Ethiopia, Africa

Eastern moose (Alces americanus) males confront each other on a snowy forest track after the rutting season. A friendly fight that allows the dominant male to consolidate his stature. Parc de la Gaspesie. Quebec. Canada

Red deer (Cervus elaphus) stag fighting, England

Red deer (Cervus elaphus) facing each other before a fight at sunset during the bellowing period.

Dominant male mountain gorilla (Gorilla beringei beringei) in rainforest. Uganda. Bwindi Impenetrable Forest National Park.

Big male of chimpanzee (Pan troglodytes) on mangrove branches. Republic of the Congo. Conkouati-Douli Reserve.

Couple of wolfs (Canis Lupus) on snow, captive, Sumava National Park, Bohemian Forest, Czech Republic, Europe