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Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

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

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Adult bull Type A killer whale (Orcinus orca) power lunging in the Gerlache Strait, Antarctica, Polar Regions

Adult bull Type A killer whale (Orcinus orca) surfacing in the Gerlache Strait, Antarctica, Polar Regions

Charging southern elephant seal bull (Mirounga leonina), St. Andrews Bay, South Georgia, Polar Regions

Adult bull Antarctic fur seal (Arctocephalus gazella), head detail, Stromness Harbor, South Georgia, Polar Regions

Large Bull Elk (Cervus canadensis) standing in deep snow during winter in Banff National Park, UNESCO World Heritage Site, Alberta, The Rockies, Canada, North America

Bull Elk (Wapiti) (Cervus canadensis) in autumn willows with tongue out, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Bull Elk (Wapiti) (Cervus canadensis) in autumn willows, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Young southern elephant seal bulls (Mirounga leoninar), mock-fighting on the beach in Gold Harbor, South Georgia, Polar Regions

African elephant (Loxodonta africana) bull, Zimanga private game reserve, KwaZulu-Natal, South Africa

Mundari man with a Kalashnikov posing with a bull with giant horns, Mundari tribe, South Sudan, Africa

Adult bull southern elephant seal (Mirounga leonina) attempting to cool off by flinging sand on his back, South Georgia, Polar Regions

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) on the beach in Torellneset, Nordauslandet, Svalbard, Arctic, Norway, Scandinavia, Europe

Young southern elephant seal bull (Mirounga leoninar), molting on the beach in Gold Harbor, South Georgia, Polar Regions

Adult bull killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the beach in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the beach in the Svalbard Archipelago, Norway, Arctic, Europe

An adult bull introduced reindeer (Rangifer tarandus) before eradication in Stromness Bay, South Georgia, Polar Regions

Sculpture of an iron bull at Topaz Restaurant, Phnom Penh, Cambodia, Indochina, Southeast Asia, Asia

Adult bull Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Antarctica, Polar Regions

A pair of adult bull Antarctic fur seals (Arctocephalus gazella), fighting in Right Whale Bay, South Georgia, South Atlantic, Polar Regions

Image of Nefertari on left, Sacred Cows, Paintings and Relief, Tomb of Nefertari, QV66, Valley of the Queens, Ancient Thebes, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

Bull elk (Cervus canadensis) standing in a stream, Rocky Mountain National Park, Colorado, United States of America, North America

Southern elephant seal bull (Mirounga leoninar), on the beach at sunrise in Gold Harbor, South Georgia, Polar Regions

Female southern elephant seal with young male (Mirounga leoninar), on the beach at Salisbury Plain, South Georgia, Polar Regions

Southern elephant seal bull (Mirounga leoninar), on the beach at sunrise in Gold Harbor, South Georgia, Polar Regions

An injured bull California sea lion (Zalophus californianus), hauled out on Isla San Pedro Martir, Sea of Cortez, Mexico, North America

Young southern elephant seal bulls (Mirounga leoninar), mock-fighting on the beach in Gold Harbor, South Georgia, Polar Regions

Adult bull killer whale (Orcinus orca), power-lunging while feeding on fish along the coast of eastern Greenland, Polar Regions

Young southern elephant seal bulls (Mirounga leoninar), molting on the beach in Gold Harbor, South Georgia, Polar Regions

Bull elephant (Loxodonta africana) walking off, Madikwe Reserve, North West Province, South Africa, Africa

An adult bull porcupine caribou (Rangifer tarandus granti), hiding in fall color changes in Denali National Park, Alaska, United States of America, North America

Southern elephant seal bull (Mirounga leoninar), sounding a challenge on the beach at Gold Harbor, South Georgia, Polar Regions

Southern elephant seal bull (Mirounga leoninar), sounding a challenge on the beach at Gold Harbor, South Georgia, Polar Regions

Bull California sea lion (Zalophus californianus), on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

Adult bull Antarctic fur seal (Arctocephalus gazella), head detail, Stromness Harbor, South Georgia, Polar Regions

Young southern elephant seal bulls (Mirounga leoninar), molting on the beach in Gold Harbor, South Georgia, Polar Regions

Adult bull Atlantic walrus (Odobenus rosmarus rosmarus) rolling on its back on ice in Storfjorden, Svalbard, Arctic, Norway, Scandinavia, Europe

Adult bull Antarctic fur seals (Arctocephalus gazella) fighting in Stromness Harbor, South Georgia, Polar Regions

Bull Elk (Wapiti) (Cervus canadensis) in autumn willows, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Southern elephant seal bull (Mirounga leoninar), in the tussah grass at Salisbury Plain, South Georgia, Polar Regions

A farmer drives a carriage pulled by two animals, Australia, Matanzas, Cuba, West Indies, Central America

Adult Antarctic fur seal (Arctocephalus gazella), bull and cow on Prion Island, South Georgia Island, South Atlantic, Polar Regions

Elephant, Loxodonta africana, bull in close up at water in Addo Elephant National park, Eastern Cape, South Africa

Two adult bull southern elephant seals (Mirounga leonina), fighting on the beach on Snow Island, Antarctica, Polar Regions

Two bull elk (Cervus canadensis) sparring in the snow, Jasper National Park, Alberta, Canada, North America

Antarctic fur seal harem (Arctocephalus gazella) at the old whaling station at Grytviken, South Georgia Island, Polar Regions

Bull elk near Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

California sea lion (Zalophus californianus) bull and pup hauled out on Los Islotes, Baja California Sur, Mexico, North America

Adult bull Antarctic fur seal (Arctocephalus gazella) head detail in Salisbury Plain, South Georgia, Polar Regions

Bull moose (Alces alces), standing in front of Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

White rhino (Ceratotherium simum) bull at water, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Sculptor working on large moulded deity and Nandi the bull, made from clay from the River Hugli, Kumartuli district, Kolkata, West Bengal, India, Asia

Four adult bull southern elephant seals (Mirounga leonina), fighting on the beach on Snow Island, Antarctica, Polar Regions

Adult male Thornicrofts giraffes (Giraffa camelopardalis thornicrofti), South Luangwa National Park, Zambia, Africa

Adult bull Roosevelt elk (Cervus canadensis roosevelti), in rut near Highway 101, California, United States of America, North America

Adult bull Roosevelt elk (Cervus canadensis roosevelti), in rut near Highway 101, California, United States of America, North America

Southern elephant seal bull (Mirounga leoninar), at breeding beach in King Haakon Bay, South Georgia, Polar Regions

A bull Antarctic fur seal (Arctocephalus gazella), on the rocks at Coronation Island, South Orkneys, Antarctica, Polar Regions

Two young bull southern elephant seals (Mirounga leonina), fighting on the beach on Snow Island, Antarctica, Polar Regions

Gentoo penguin (Pygoscelis papua) at nesting site on Bull Point, East Island, Falkland Islands, South America

Bull Elk (Wapiti), Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Adult bull Steller sea lion (Eumetopias jubatus), catching salmon at the Solomon Gulch Hatchery, Valdez, Alaska, United States of America, North America

Gentoo penguins (Pygoscelis papua) at nesting site on Bull Point, East Island, Falkland Islands, South America

Adult California sea lion (Zalophus californianus) bull underwater at Los Islotes, Baja California Sur, Mexico, North America

Southern elephant seal bull (Mirounga leoninar), throwing sand at breeding beach in St. Andrews Bay, South Georgia, Polar Regions

African elephant (Loxodonta africana) bull, Zimanga private Game Reserve, KwaZulu-Natal, South Africa, Africa

Highland bull in snow, conservation grazing on Arnside Knott, Cumbria, England, United Kingdom, Europe

Bull Elk (Wapiti), Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Bull moose (Alces alces), in snow staring back, Grand Teton National Park, Wyoming, United States of America, North America

Nyala (Tragelaphus angasii) male at water, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Bull Elk (Wapiti), Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America