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Adult bull Steller sea lions (Eumetopias jubatus), mock fighting, Inian Islands, Alaska, United States of America, North America

View of a male pink salmon, Oncorhynchus gorbuscha, in the Indian River spawning near Sitka, Alaska, United States of America

An adult male common basilisk, Basiliscus basiliscus, in Corcovado National Park, Osa Peninsula, Costa Rica, Central America

Black-browed albatross, Thalassarche melanophris, courtship display on New Island, Falkland Islands, South Atlantic Ocean

Male Spotted-backed weaver (Village weaver) (Ploceus cucullatus) collecting grass for his nest, Addo Elephant National Park, South Africa, Africa

Adult male Galapagos yellow warbler (Setophaga petechia aureola) at Puerto Egas, Santiago Island, Galapagos Islands, Ecuador, South America

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

Greater kudu (Tragelaphus strepsiceros) buck, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Young bull southern elephant seals, Mirounga leonina, fighting for territory in Gold Harbour, South Georgia Island, Atlantic Ocean

Adult gentoo penguins (Pygoscelis papua) courtship display, Neko Harbor, Antarctica, Southern Ocean, Polar Regions

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

Striated caracara (Phalcoboenus australis) pair, Carcass Island, Falkland Islands, South Atlantic Ocean, South America

Muskox bulls (Ovibos moschatus), Myggebukta (Mosquito Bay), Christian X's Land, Northeast Greenland, Polar Regions

Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

Two blesbok (Damaliscus pygargus phillipsi) facing off, Mountain Zebra National Park, South Africa, Africa

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

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

Male defassa waterbuck (Kobus ellipsiprymnus defassa), Masai Mara National Reserve, Kenya, East Africa, Africa

Common Waterbuck (Ellipsen Waterbuck) (Kobus ellipsiprymnus ellipsiprymnus) buck, Kruger National Park, South Africa

The Port of Liverpool Building, one of the Three Graces, with statue of Edward VII in the foreground, riverside, Liverpool, Merseyside, England, United Kingdom, Europe

Adult Northern (Steller) sea lion (Eumetopias jubatus) bull looking for fish scraps from fishermen in Petersburg, Southeastern Alaska, United States of America, North America

Two Gentoo penguins (Pygoscelis papua) fighting on the beach, Saunders Island, Falkland Islands, South America

Male Scott’s oriole (Icterus parisorum), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Two common zebra (Plains zebra) (Burchell's zebra) (Equus burchelli) sparring, Ngorongoro Crater, Tanzania, East Africa, Africa

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

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

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

Male pyrrhuloxia (Cardinalis sinuatus), The Pond, Amado, Arizona, United States of America, North America

Male impala (Aepyceros melampus) with two red-billed oxpeckers (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

Male dusky grouse (blue grouse) (Dendragapus obscurus) displaying, Yellowstone National Park, Wyoming, United States of America, North America

Heermann's gull (Larus heermanni) male feeding female, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Male lava lizard (Microlophus spp), Las Bachas, Santa Cruz Island, Galapagos Islands, Ecuador, South America

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

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

An adult male plumed basilisk, Basiliscus plumifrons, Cano Chiquerra, Tortuguero National Park, Costa Rica, Central America

A boy walks his camel through one of the 368 alleyways contained within the city of Harar, Ethiopia, Africa

Male Red-Winged Blackbird (Agelaius phoeniceus), Yellowstone National Park, Wyoming, United States of America, North America

Young bull southern elephant seal, Mirounga leonina, sneaking near female, Gold Harbour, South Georgia Island, Atlantic Ocean

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

Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

Blue-footed booby (Sula nebouxii) pair, North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult bull Steller sea lions (Eumetopias jubatus), mock fighting, Inian Islands, Alaska, United States of America, North America

Father and son fish from Golden Gardens Park, Olympic Mountains in distance, Seattle, Washington State, United States of America (U.S.A.), North America

Male Yellow-Headed Blackbird (Xanthocephalus xanthocephalus), Yellowstone National Park, Wyoming, United States of America, North America

Mountain Bluebird (Sialia currucoides) male, Yellowstone National Park, Wyoming, United States of America, North America

Male Audubon's Yellow-Rumped Warbler (Dendroica coronata auduboni), Yellowstone National Park, Wyoming, United States of America, North America

Male Wood Bison (Wood Buffalo) (Bison bison athabascae), Alaska Highway, British Columbia, Canada, North America

Adult male kelp goose, Chloephaga hybrida, feeding on kelp at low tide at West Point Island, Falkland Islands, South Atlantic Ocean

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

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

Muskox bull (Ovibos moschatus), Myggebukta (Mosquito Bay), Christian X's Land, Northeast Greenland, Polar Regions

Male thick-legged flower beetle (Oedemera nobilis) foraging on common hogweed (Heracleum sphondylium) flowers, Wiltshire, England, United Kingdom, Europe

Male Williamson's sapsucker (Sphyrapicus thyroideus) poking out of its nest hole, Yellowstone National Park, Wyoming, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams during the rut, Clear Creek County, Colorado, United States of America, North America

Male red-winged blackbird (Agelaius phoeniceus) displaying, Pawnee National Grassland, Colorado, United States of America, North America

Adult bull killer whale (Orcinus orca) surfacing at sunset near Point Adolphus, Icy Strait, Southeast Alaska, United States of America, North America

Young bull southern elephant seals, Mirounga leonina, fighting for territory in Gold Harbour, South Georgia Island, Atlantic Ocean

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

Bison (Bison bison) bull in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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