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An adult male green Iguana (Iguana iguana), head bobbing in the sun at the airport in Guayaquil, Ecuador, South America

Galapagos lava lizard (Microlophus albemarlensis) pair in courtship on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult male Galapagos lava lizard (Microlophus albemarlensis), on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult male Galapagos sea lion (Zalophus wollebaeki), underwater on Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A pair of adult male great frigatebirds (Fregata minor), in flight over Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult bull killer whale (Orcinus orca), surfacing near the Cleveland Peninsula, Southeast Alaska, United States of America, North America

Male chukar (Alectoris chukar), Antelope Island State Park, Utah, United States of America, North America

A male Wilson's bird-of-paradise (Cicinnurus respublica), in courtship display on Waigeo Island, Raja Ampat, Indonesia, Southeast Asia, Asia

An adult female red bird-of-paradise (Paradisaea rubra), perched on Gam Island, Raja Ampat, Indonesia, Southeast Asia, Asia

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

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

South American sea lion bull (Otaria flavescens) at breeding colony just outside Ushuaia, Beagle Channel, Argentina, South America

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

Two male lions (Panthera leo) resting while wildebeest (Connochaetes taurinus) gather for drinking, Serengeti, Tanzania, East Africa, Africa

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

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

An adult male acorn woodpecker (Melanerpes formicivorous), Madera Canyon, southern Arizona, Arizona, United States of America, North America

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

Male lion (Panthera leo), Ndutu, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

An adult male lion (Panthera leo), Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Adult male Galapagos lava lizard (Microlophus albemarlensis), Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult male Galapagos sea lion (Zalophus wollebaeki), underwater on Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult male great frigatebird (Fregata minor), on the nest on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

Rooster at the home of a local family in Tangkoko National Preserve on Sulawesi Island, Indonesia, Southeast Asia, Asia

An adult male Celebes crested macaque (Macaca nigra), foraging in Tangkoko Batuangus Nature Reserve, Sulawesi, Indonesia, Southeast Asia, Asia

Young male lion (Panthera leo), 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

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

Adult male walrus (Odobenus rosmarus) hauling out on the beach at Poolepynten, Svalbard, Norway, Europe

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

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

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

An adult male broad-billed hummingbird (Cynanthus latirostris magicus), Madera Canyon, southern Arizona, Arizona, United States of America, North America

Two young male lions (Panthera leo) in the bush, Tsavo East National Park, Kenya, East 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 (Loxodonta africana) bull, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

An adult male desert spiny lizard (Sceloporus magister), under a ledge in Grand Canyon National Park, Arizona, United States of America, North America

An adult male green Iguana (Iguana iguana), basking in the sun at the airport in Guayaquil, Ecuador, South America

An adult male green Iguana (Iguana iguana), basking in the sun at the airport in Guayaquil, Ecuador, South America

Male Northern Cardinal (Cardinalis cardinalis), a mid sized songbird common in Eastern North America, Bermuda, Atlantic, North America

An adult male Celebes crested macaque (Macaca nigra), foraging in Tangkoko Batuangus Nature Reserve, Sulawesi, Indonesia, Southeast Asia, Asia

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

A pair of juvenile male southern elephant seals (Mirounga leonina), mock-fighting in Karukinka Natural Park, Chile, South America

Male Black-Bellied Bustard (Black-Bellied Korhaan) (Eupodotis melanogaster), Masai Mara National Reserve, Kenya, East Africa, Africa

A male Wilson's bird-of-paradise (Cicinnurus respublica), in courtship display on Waigeo Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Magnificent frigatebirds (Fregata magnificens), San Gabriel Bay, Espiritu Santo Island, Baja California Sur, Mexico, North America

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

California sea lion bull (Zalophus californianus) on Isla San Pedro Martir, Baja California, Mexico, North America

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

An adult male broad-billed hummingbird (Cynanthus latirostris magicus), Madera Canyon, southern Arizona, Arizona, United States of America, North America

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

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

An adult male Celebes crested macaque (Macaca nigra), foraging in Tangkoko Batuangus Nature Reserve, Sulawesi, Indonesia, Southeast Asia, Asia

Adult male Celebes crested macaque (Macaca nigra), foraging in Tangkoko Batuangus Nature Reserve, Sulawesi, Indonesia, Southeast Asia, Asia

Young,male olive baboon (Papio cynocephalus anubis) sitting atop a tree trunk, Samburu National Reserve, Kenya, East Africa, Africa

A pair of juvenile male southern elephant seals (Mirounga leonina), mock-fighting in Karukinka Natural Park, Chile, South America

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