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

Southern elephant seal bull (Mirounga leonina), molting in Gold Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

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

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

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

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

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

Southern elephant seal (Mirounga leonina) bull holding female down for mating, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions

Bull elk (Cervus canadensis), in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Adult bull southern elephant seal (Mirounga leonina), skull on display at the Natural History Museum in Stanley, Falklands, South America

California sea lion bulls (Zalophus californianus), hauled out on a small islet off San Marcos Island, Sea of Cortez, Mexico, North America

Southern elephant seal bulls (Mirounga leonina), molting in Gold Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

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

Southern elephant seal bull (Mirounga leonina) molting in Gold Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

Minoan Palace, Palace of Knossos, North Entrance, Iraklion (Heraklion) (Iraklio), Crete, Greek Islands, Greece, Europe

Bull elk (Cervus canadensis) fighting in rut in Rocky Mountain National Park, Colorado, United States of America, North America

South American sea lion bull (Otaria flavescens) at breeding colony just outside Ushuaia, Beagle Channel, Argentina, South America

Bull elk (Cervus canadensis) licking his nose in the fall, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Bull Galapagos sea lion (Zalophus wollebaeki) underwater at Santiago Island, Galapagos, Ecuador, South America

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

Young Southern elephant seal (Mirounga leonina), bulls mock fighting at Gold Harbour, South Georgia, South Atlantic, Polar Regions

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

Adult Antarctic fur seal (Arctocephalus gazella), bulls fighting in Hercules Bay on South Georgia Island, Polar Regions

Young Southern elephant seal (Mirounga leonina), bulls mock fighting at Gold Harbour, South Georgia, South Atlantic, Polar Regions

Antarctic fur seal (Arctocephalus gazella) adult bull, Prion Island, South Georgia, UK Overseas Protectorate, Polar Regions

Galapagos sea lion (Zalophus wollebaeki) adult bull, Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

The north entrance passage containing a fresco of a charging bull at the Minoan site of Knossos, excavated in the early 20th century by British archaeologist Sir Arthur Evans, Crete, Greek Islands, Greece, Europe

Bull moose (Alces alces) close up in laughing pose, Grand Teton National Park, Wyoming, United States of America, North America

California sea lion bulls (Zalophus californianus), hauled out on a small islet off San Marcos Island, Sea of Cortez, Mexico, North America

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

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

Young Southern elephant seal (Mirounga leonina), bulls lying near each other at Gold Harbour, South Georgia, South Atlantic, Polar Regions

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

Southern elephant seal bulls (Mirounga leonina) mock-fighting in Gold Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

California sea lion bulls (Zalophus californianus), hauled out on a small islet off San Marcos Island, Sea of Cortez, Mexico, North America

Bull moose (Alces alces), in the snow with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

Bull elk (Cervus canadensis) eating yellow wildflowers, Jasper National Park, Alberta, Canada, North America

Adult bull Steller sea lions (Eumetopias jubatus), territorial display at the Solomon Gulch Hatchery, Valdez, Alaska, United States of America, North America

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

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

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

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

Adult bull killer whales (Orcinus orca), surfacing near the Cleveland Peninsula, Southeast Alaska, United States of America, North America

Minoan Palace, Palace of Knossos, North Entrance, Iraklion (Heraklion) (Iraklio), Crete, Greek Islands, Greece, Europe

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

Bull elk (Cervus canadensis) in the fall, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

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

Antarctic fur seal (Arctocephalus gazella) males defending territories, Stromness Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

Adult bull Svalbard reindeer (Rangifer tarandus platyrhynchus), at Augustabreen, Nordaustlandet, Svalbard, Norway, Scandinavia, Europe

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

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

Cape buffalo (African buffalo) (Syncerus caffer) bull drinking, Kruger National Park, South Africa, Africa

Bull Moose (Alces alces) without antlers in the snow, Grand Teton National Park, Wyoming, United States of America, North America

African elephant (Loxodonta Africana) bull at dusk, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Adult endemic South Georgia pipit (Anthus antarcticus), near elephant seal bull in Gold Harbor, South Georgia, Polar Regions

King penguins (Aptenodytes patagonicus), near bull elephant seal in Gold Harbor, South Georgia, Polar Regions

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

Southern elephant seal bull (Mirounga leonina), in Stromness Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

Bull elk (Cervus canadensis) fighting in rut in Rocky Mountain National Park, Colorado, United States of America, North America

Adult bull Antarctic fur seal (Arctocephalus gazella), hauled out on first year sea ice in the Weddell Sea, Antarctica, Polar Regions

Adult bull sperm whale (Physeter macrocephalus), preparing to dive deep near Isla San Jose, Baja California Sur, Mexico, North America

Adult bull northern elephant seal (Mirounga angustirostris), Benito del Oeste Island, Baja California, Mexico, North America

Reliefs in Tomb KV11, the tomb of ancient Egyptian Ramesses III, Valley of the Kings, UNESCO World Heritage Site, Thebes, Egypt, North Africa, Africa

Elephant, Loxodonta africana, bull at Hapoor waterhole in Addo Elephant National Park, Eastern Cape, South Africa, Africa

Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

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

Adult bull northern fur seal (Callorhinus ursinus) on St. Paul Island, Pribilof Islands, Alaska, United States of America, North America

Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

Elephant (Loxodonta africana) bull, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Elephant bulls (Loxodonta africana) playing in water, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Adult bull killer whale (Orcinus orca), surfacing off Kagamil Island, Aleutian Islands, Alaska, United States of America, North America

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

Bull elk (Cervus canadensis) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Bull elk (Cervus canadensis), along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bull elk (Cervus canadensis) with antlers in velvet, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bull Elk (Cervus canadensis) in snow, Yellowstone National Park, Wyoming, United States of America, North America

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