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California sea lion bull (Zalophus californianus) half above and half below with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

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

Southern elephant seal (Mirounga leonina) bull, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Bull elk (Cervus canadensis) demonstrating the flehmen response, Jasper National Park, Alberta, Canada, North America

Statue at the bull ring, Plaza de Toros de la Maestranza, El Arenal district, Seville, Andalusia (Andalucia), Spain, Europe

Bull elk (Cervus canadensis) in the snow, National Elk Refuge, Jackson, Wyoming, United States of America, North America

Cattle at Beach of Cabo Pulmo, Bos primigenius, Cabo Pulmo National Park, Baja California Sur, Mexico

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

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting, Genovesa Island, Galapagos Islands, Ecuador, South America

Cattle at Beach of Cabo Pulmo, Bos primigenius, Cabo Pulmo National Park, Baja California Sur, Mexico

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

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

Antarctic fur seal (Arctocephalus gazella) bulls establishing mating territories at the abandoned Stromness Whaling Station, South Georgia Island, South Atlantic Ocean, Polar Regions

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

Bull Elk with velvet covered antlers in Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Two bull elk (Cervus canadensis) sparring during the rut, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

Statue of Curro Romero a famous matador, Bull Ring, Plaza de Toros de la Maestranza, El Arenal district, Seville, Andalusia (Andalucia), Spain, Europe

Cattle at Beach of Cabo Pulmo, Bos primigenius, Cabo Pulmo National Park, Baja California Sur, Mexico

Cattle at Beach of Cabo Pulmo, Bos primigenius, Cabo Pulmo National Park, Baja California Sur, Mexico

Cattle at Beach of Cabo Pulmo, Bos primigenius, Cabo Pulmo National Park, Baja California Sur, Mexico

Hamer (Hamar) people walking back from bull jumping ceremony,Turmi, Lower Omo Valley, Ethiopia, Africa

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

Bull standing in front of a village main house in a rural area of Northern Senegal, West Africa, Africa

Bull moose (Alces alces) amongst autumn (fall) vegetation; Grand Teton National Park, Wyoming, United States of America, North America

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

A view over Mijas bullring, Plaza de Toros, and the whitewashed buildings of the Andalusia town of Mijas Pueblo, Andalusia, Spain, Europe

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

Southern elephant seal (Mirounga leonina) bulls fighting for territory for mating, Gold Harbour, South Georgia, UK Overseas Protectorate, Polar Regions

Southern elephant seal (Mirounga leonina), beachmaster bull with female harem, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions

Southern elephant seal (Mirounga leonina) bull next to female, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions

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

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

Bas Relief of Boats, Tomb of Seti I, KV17, Valley of the Kings, 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

Bull elephant (Loxodonta africana), drinking, Addo Elephant National Park, Eastern Cape, South Africa, Africa

Young bull moose (Alces alces), Kincaid Park, Anchorage, Alaska, United States of America, North America

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

Adult beachmaster bull southern elephant seal (Mirounga leonina) holding female down with his weight, South Georgia, Polar Regions

Young challenger bull southern elephant seal (Mirounga leonina) fleeing from beachmaster bull, South Georgia Island, Polar Regions

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) trying to cool off by flinging sand on his back at Gold Harbour, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) challenger bull head detail (notice shredded proboscis) at Gold Harbour, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull issuing a vocalization challenge at Gold Harbour on South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) challenger bull head detail at Gold Harbour on South Georgia Island, Polar Regions

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

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

Northern (Steller) sea lion (Eumetopias jubatus) bull feeding on fisherman's scraps near Petersburg, Alaska, United States of America, North America

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

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

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

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

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

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

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

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

Adult bull killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

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

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

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the ice 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

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

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island 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

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island 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

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island 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

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island 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