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

Adult male magnificent frigatebird (Fregata magnificens), Las Bachas, Santa Cruz Island, Galapagos Islands, Ecuador, South America

Galapagos marine iguana (Amblyrhynchus cristatus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

An adult male anhinga, Anhinga anhinga, at night in Tortuguero National Park, Costa Rica, Central America

Male springbok (Antidorcas marsupialis), Kgalagadi Transfrontier Park, former Kalahari Gemsbok National Park, South Africa

Male Kirk's dik dik (Kirk's dik-dik) (Madoqua kirkii), Serengeti National Park, Tanzania, East Africa, Africa

Svalbard reindeer (Rangifer tarandus platyrhynchus) buck in velvet, Spitsbergen, Svalbard Archipelago, Norway, Scandinavia, Europe

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

Southern elephant seals (Mirounga leonina), Peggotty Bluff, South Georgia, South Atlantic Ocean, Polar Regions

Reef with male and female redfin anthias (Pseudanthias dispar), Sulawesi, Indonesia, Southeast Asia, Asia

Pronghorn (Antilocapra americana) bucks sparring, Yellowstone National Park, Wyoming, United States of America, North America

Male Sumatran rhino (Borneo rhino) (Dicerorhinus sumatrensis) in wallow, Tabin Reserve, Sabah, Borneo, Malaysia, Southeast Asia, Asia

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

Southern elephant seal (Mirounga leonina) bull, Peggotty Bluff, South Georgia, South Atlantic Ocean, Polar Regions

Adult male magnificent frigatebird (Fregata magnificens), Las Bachas, Santa Cruz Island, Galapagos Islands, Ecuador, South America

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

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

Southern elephant seal (Mirounga leonina), male on sandy beach, Sea Lion Island, Falkland Islands, South America

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

Two teenaged male African Elephant (Loxodonta africana) playing, Kruger National Park, South Africa, Africa

Lion (Panthera leo), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Male Namaqua sandgrouse (Pterocles namaqua), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

Adult black-browed albatross (Thalassarche melanophrys) pair, nesting site on New Island, Falklands, South Atlantic Ocean, South America

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

Adult male kelp goose (Chloephaga hybrida), New Island, Falkland Islands, South Atlantic Ocean, South America

Magellanic oystercatcher (Haematopus leucopodus) pair, Carcass Island, Falklands, South Atlantic Ocean, South America

Male Williamson's sapsucker (Sphyrapicus thyroideus), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Male mountain bluebird (Sialia currucoides), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bulls sparring, Custer State Park, South Dakota, United States of America, North America

Adult male great frigatebird (Fregata minor), Genovesa Island, Galapagos Islands, UNESCO World Heritge Site, Ecuador, South America

Male mountain bluebird (Sialia currucoides), Douglas County, Colorado, United States of America, North America

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

Bighorn sheep (Ovis canadensis) ram, Clear Creek County, Colorado, United States of America, North America

Male Barrow's goldeneye (Bucephala islandica), Manning Provincial Park, British Columbia, Canada, North America

Common ostrich (Struthio camelus) male watching chicks, Masai Mara National Reserve, Kenya, East Africa, Africa

Male Namaqua sandgrouse (Pterocles namaqua), Kgalagadi Transfrontier Park, former Kalahari Gemsbok National Park, South Africa

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

Lion (Panthera leo), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Reef with male and female redfin anthias (Pseudanthias dispar), Sulawesi, Indonesia, Southeast Asia, Asia

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

Elk with Rocky Mountains in the background, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

White-tailed deer (whitetail deer) (Virginia deer) (Odocoileus virginianus) buck, Custer State Park, South Dakota, United States of America, 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