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

Reliefs, Mastaba of Idut, Step Pyramid Complex, UNESCO World Heritage Site, Saqqara; Egypt, North Africa, Africa

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

Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

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

Southern elephant seal bulls (Mirounga leonina) charging on the beach in Gold Harbor, South Georgia, 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

Adult bull Galapagos fur seal (Arctocephalus galapagoensis) underwater on Genovesa Island, Galapagos, Ecuador, South America

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

Charging Bull and Olive Tree Fresco, The Minoan Palace of Knossos, Knossos, Heraklion, Crete, Greek Islands, Greece, Europe

Charging Bull and Olive Tree Fresco, The Minoan Palace of Knossos, Knossos, Heraklion, Crete, Greek Islands, Greece, Europe

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, Jasper National Park, UNESCO World Heritage Site, Alberta, 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

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

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

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

Young southern elephant seal bulls (Mirounga leoninar), mock-fighting on the beach 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

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

Young southern elephant seal bull (Mirounga leoninar), molting 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

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

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

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

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

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

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 Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

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

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

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

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

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

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

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

Beachmaster bull southern elephant seal (Mirounga leonina) attempting to mate at Peggotty Bluff, South Georgia, Polar Regions

Young adult bull southern elephant seal (Mirounga leonina) close up while swimming in glacier run off, South Georgia Island, 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) mating in the surf at Gold Harbour on South Georgia Island, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellow towards another male, 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) challenger bull among king penguin chicks at Gold Harbour on South Georgia, Polar Regions

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

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

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

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

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

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult bull southern elephant seal (Mirounga leonina) hauled out to molt at Grytviken on South Georgia, Polar Regions

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) flipping sand onto its back to cool off 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

View of the exterior of the Corn Palace, Mitchell, South Dakota, United States of America, North America

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

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