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Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America

Ring-tailed Lemurs (Lemur catta), all white baby male (Sapphire) albino lemur suckling on mother, Berenty, Southern Madagascar, Africa

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

Male Impala (Aepyceros melampus) with a Red-Billed Oxpecker (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

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

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

Breeding pair of kelp geese (Chloephaga hybrida), Wildlife Conservation Society Preserve of Karukinka, Strait of Magellan, Chile, South America

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

Two hippopotamus (Hippopotamus amphibius) sparring, Serengeti National Park, Tanzania, East Africa, Africa

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

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

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

Snorkellers with a juvenile whale shark (Rhincodon typus) feeding at the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

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

Two teenaged male African Elephant (Loxodonta africana) playing, Kruger 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

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

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

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

Southern elephant seal (Mirounga leonina) bull with skua, Peggotty Bluff, 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

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

Adult male Atlantic walrus (Odobenus rosmarus rosmarus), Kapp Lee, Edgeoya, Svalbard Archipelago, Arctic, Norway, Europe

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

South American sea lions, Otaria flavescens, hauled out on a small islet in the Beagle Channel, Ushuaia, Argentina, South America

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

Male Red-Winged Blackbird (Agelaius phoeniceus), 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

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

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

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

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

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

Lazuli bunting (Passerina amoena), male in winter plumage, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

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

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

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

Two Bison (Bison bison) bulls 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

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

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

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

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

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

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

Curious adult bull Steller sea lion (Eumetopias jubatus), Inian Islands, Southeast Alaska, 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 Namaqua sandgrouse (Pterocles namaqua), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

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

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

Southern elephant seals (Mirounga leonina), Peggotty Bluff, 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

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