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Blue-footed booby (Sula nebouxii) pair in courtship display on North Seymour Island, Galapagos, Ecuador, South America

Breeding elegant terns (Thalasseus elegans) return to colony on Isla Rasa, Baja California Norte, Mexico, North America

Red fox (Vulpes fulva) kit, in captivity, Sandstone, Minnesota, United States of America, North America

A colorful warty frogfish, Antennarius maculatus, yawns as it waits for prey to swim close by in Komodo National Park, Indonesia.

A colorful warty frogfish, Antennarius maculatus, yawns as it waits for prey to swim close by in Komodo National Park, Indonesia.

Agonistic behaviour in a tight group of moulting southern elephant seals (Mirounga leonina), Grytviken, South Georgia, Polar Regions

Magellanic penguin (Spheniscus magellanicus) pair resting in coastal habitat, Gypsy Cove, Falkland Islands, South America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Columbian ground squirrel (Citellus columbianus) eating, Waterton Lakes National Park, Alberta, Canada, North America

Lion (Panthera leo) pride on the move, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Spotted hyena (spotted hyaena) (Crocuta crocuta), Masai Mara National Reserve, Kenya, East Africa, Africa

This fish is having its gills cleaned by a cleaner wrasse so it opens wide allowing the fish to come in and feed on parasites, Raja Ampat, Indonesia.

A male yellow barred jawfish (Opistognathus randalli), broods eggs in its mouth, Anilao, Philippines.

An adult jacare caiman (Caiman yacare), on the river banks of the Rio Negro, Mato Grosso, Pantanal, Brazil, South America

A young jacare caiman (Caiman yacare), on the river banks of the Rio Tres Irmao, Mato Grosso, Pantanal, Brazil, South America

Grey squirrel (Sciurus carolinensis), in city park, Brandon Park, Bristol, England, United Kingdom, Europe

Indian tiger, (Bengal tiger) (Panthera tigris tigris), Bandhavgarh National Park, Madhya Pradesh state, India, Asia

An unidentified moray eel (Gymnothorax sp.) swims over a sandy seafloor in Komodo National Park, Indonesia.

A snowflake moray eel (Echidna nebulosa) peeks out from a dark hole on a reef in Komodo National Park, Indonesia.

An adult azure kingfisher (Alcedo azurea) swallowing a fish on the Daintree River, Daintree rain Forest, Queensland, Australia, Pacific

Two male lions (Panthera leo) in the bush, Taita Hills Wildlife Sanctuary, Kenya, East Africa, Africa

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

An adult Galapagos land iguana (Conolophus subcristatus) climbing tree on North Seymour Island, Galapagos, Ecuador, South America

Woolly-necked stork (Ciconia episcopus), Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

A young male polar bear (Ursus maritimus) on an ice floe in Baffin Bay, Nunavut, Canada, North America

Nile crocodile (Crocodylus niloticus) mouth open in the river Chobe, Chobe National Park, Botswana, Africa

Bull moose (Alces alces), close up with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

Gray Wolf (Canis lupus) in snow in captivity, near Bozeman, Montana, United States of America, North America

A young jacare caiman (Caiman yacare), on the river banks of the Rio Tres Irmao, Mato Grosso, Pantanal, Brazil, South America

Close up underwater portrait of a jacare caiman (Caiman yacare) in the Rio Claro, Mato Grosso, Brazil, South America

Two adult bull southern elephant seals (Mirounga leonina), fighting on the beach on Snow Island, Antarctica, Polar Regions

Two lion (Panthera leo) at a blue wildebeest kill, Serengeti National Park, Tanzania, East Africa, Africa

Close-up of a gentoo penguin (Pygoscelis papua) feeding its chick, Volunteer Point, Falkland Islands, South America

Black-tailed prairie dog (blacktail prairie dog) (Cynomys ludovicianus) calling, Custer State Park, South Dakota, United States of America, North America

Adult spotted hyena (Crocuta crocuta), with wildebeests in Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Two young bull southern elephant seals (Mirounga leonina), fighting on the beach on Snow Island, Antarctica, Polar Regions

Hippopotamus Amphibius (Hippo), open jaw used as warning by males protecting females, plentiful in the Luangwa River, Zambia, Africa

Crabeater seal (Lobodon carcinophaga) showing teeth while resting on ice floe in Paradise Bay, Antarctica, Polar Regions

Western meadowlark (Sturnella neglecta) calling, Antelope Island State Park, Utah, United States of America, North America

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

Juvenile pale chanting goshawk (Melierax canorus), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Photographer Skip Brown on his foiling kiteboard on the Chesapeake Bay near Annapolis, Maryland, United States of America, North America

Whale shark (Rhincodon typus) underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

King penguin (Aptenodytes patagonicus) chick, the Neck, Saunders Island, Falkland Islands, South America

Male yellow-headed blackbird (Xanthocephalus xanthocephalus), Bear River Migratory Bird Refuge, Utah, United States of America

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

Western Meadowlark (Sturnella neglecta) singing, Antelope Island State Park, Utah, United States of America, North America

Nile crocodile (Crocodylus niloticus), Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Morelet Crocodile (Crocodylus Moreletii), Rio Lagartos Biosphere Reserve, Rio Lagartos, Yucatan, Mexico, North America

Whale shark (Rhincodon typus), underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America