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Adult bull northern elephant seal (Mirounga angustirostris), Benito del Oeste Island, Baja California, Mexico, North America

Man on a donkey cart near the Memphite Necropolis, UNESCO World Heritage Site, Egypt, North Africa Africa

Male blue-tailed damselfly (Ischnura elegans) resting on a bracken frond, Studland Heath, Dorset, England, United Kingdom, Europe

Male red-and-yellow barbet (Trachyphonus erythrocephalus), Samburu National Reserve, Kenya, East Africa, Africa

Male red-and-yellow barbet (Trachyphonus erythrocephalus), Samburu National Reserve, Kenya, East Africa, Africa

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

Cape mountain zebra (Equus zebra zebra) stallion, Mountain Zebra National Park, South Africa, Africa

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

Two bull African elephant (Loxodonta africana), Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Adult king penguins and oakum boy chicks (Aptenodytes patagonicus), at Gold Harbor, South Georgia Island, Polar Regions

Male gila woodpecker (Melanerpes uropygialis), The Pond, Amado, Arizona, United States of America, North America

Male acorn woodpecker (Melanerpes formicivorus), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Two hikers and dog enjoying snowshoeing in snowy landscape at sunset, Pallas-Yllastunturi National Park, Muonio, Lapland, Finland, Europe

Young Chilean horseman (huaso) preparing white horse at ranch, Colina, Chacabuco Province, Santiago Metropolitan Region, Chile, South America

Transient killer whale (Orcinus orca), near whale watching boat, Monterey Bay National Marine Sanctuary, California, United States of America, North America

Adult California sea lion (Zalophus californianus) bull underwater at Los Islotes, Baja California Sur, Mexico, North America

Adult female green sea turtle (Chelonia Mydas), coming ashore at night to nest, Rekawa Beach, Sri Lanka, Asia

Bighorn Sheep (Ovis canadensis) ram in the snow, Yellowstone National Park, Wyoming, United States of America, North America

Lion (Panthera leo) yawning, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Lion (Panthera leo), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

A lion pair (Panthera leo) on a kopje known as Lion Rock in Lualenyi reserve, Tsavo, Kenya, East Africa, Africa

Adult bull Steller sea lions (Eumetopias jubatus), territorial display at the Solomon Gulch Hatchery, Valdez, Alaska, United States of America, North America

Bull Elk (Wapiti), Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

A farmer preparing to feed his flock of free range chickens at Rockland Farm near Seneca, Maryland, United States of America, North America

A pod of transient killer whales (Orcinus orca), feeding on a gray whale calf carcass in Monterey Bay Marine Sanctuary, California, United States of America, North America

Adult male Guadalupe fur seal (Arctocephalus townsendi), hauled out, Isla San Pedro Martir, Baja California, Mexico, North America

Adult male California sea lion (Zalophus californianus), head detail at Los Islotes, Baja California Sur, Mexico, North America

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

Male Andean cock-of-the-rock (Rupicola peruviana), Manu National Park cloud forest, Peruvian national bird, Peru, South America

Elephants bathing in the river, Pinnewala Elephant Orphanage near Kegalle, Hill Country, Sri Lanka, Asia

Young male Defassa Waterbuck (Kobus ellipsiprymnus defassa), Masai Mara National Reserve, Kenya, East Africa, Africa

African elephant (Loxodonta africana) bulls sparring, Addo Elephant National Park, South Africa, Africa

Cape mountain zebra (Equus zebra zebra) stallion, Mountain Zebra National Park, South Africa, Africa

Leopard (Panthera pardus) and safari vehicles, Seronera, Serengeti National Park, Tanzania, East Africa, Africa

Male and female Svalbard reindeer (Rangifer tarandus platyrhynchus) at Gosbergkilen, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Two male African elephants (Loxodonta africana) displaying homosexual behavior, Tsavo, Kenya, East Africa, Africa

Male Northern cardinal (Cardinalis cardinalis), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Bull elk (Cervus canadensis), Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Adult kelp goose pair (Chloephaga hybrida), female in front, New Island Nature Reserve, Falkland Islands, South America

Cape buffalo (African buffalo) (Syncerus caffer) bull drinking, Kruger National Park, South Africa, Africa

Mountain bluebird (Sialia currucoides), male at nest cavity, Yellowstone National Park, Wyoming, United States of America, North America

Southern elephant seal bulls (Mirounga leonina), molting in Gold Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

Warthog male (Phacochoerus africanus) drinking, Zimanga game reserve, KwaZulu-Natal, South Africa, Africa

A lion pride (Panthera leo) at dusk on a kopje known as Lion Rock in Lualenyi reserve, Tsavo, Kenya, East Africa, Africa

Elephant bulls (Loxodonta africana) playing in water, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Elephant bulls (Loxodonta africana) playing in water, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Young Southern elephant seal (Mirounga leonina), bulls lying near each other at Gold Harbour, South Georgia, South Atlantic, Polar Regions

A pod of transient killer whales (Orcinus orca), near a whale watching boat in Monterey Bay Marine Sanctuary, California, United States of America, North America

Transient male killer whale (Orcinus orca), surfacing in Monterey Bay Marine Sanctuary, Monterey, California, United States of America, North America

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

Mountain bluebird (Sialia currucoides) male feeding female, near Castlewood Canyon State Park, Colorado, United States of America, North America

Male common waterbuck (Ellipsen waterbuck) (Kobus ellipsiprymnus ellipsiprymnus), Samburu National Reserve, Kenya, East Africa, Africa

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

Cape mountain zebra (Equus zebra zebra) stallion, Mountain Zebra National Park, South Africa, Africa

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

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

Male Pyrrhuloxia (Cardinalis sinuatus), Caballo Lake State Park, New Mexico, United States of America, North America

Male Phainopepla (Phainopepla nitens), San Bernadino County, California, United States of America, North America

Male and female Antarctic fur seal (Arctocephalus gazella), showing extreme sexual dimorphism, King Edward Point, South Georgia, Polar Regions

Male azure damselfly (Coenagrion puella) resting on a leaf, Wiltshire, England, United Kingdom, Europe

Bull Moose (Alces alces) without antlers in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Resting lion (Panthera leo), Kgalagadi Transfrontier Park, Kalahari, Northern Cape, South Africa, Africa