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Two southern elephant seal (Mirounga leonina) bulls rear up and attack to establish dominance, Sea Lion Island, Falkland Islands, South America

Two southern elephant seal (Mirounga leonina) bulls rear up to establish dominance, Sea Lion Island, Falkland Islands, South America

Southern elephant seal (Mirounga leonina) bull rules the harem during breeding season, Sea Lion Island, Falkland Islands, South America

Two southern elephant seal (Mirounga leonina) bulls rear up and attack to establish dominance, Sea Lion Island, Falkland Islands, South America

Two southern elephant seal (Mirounga leonina) bulls rear up to establish dominance, Sea Lion Island, Falkland Islands, South America

Southern elephant seal (Mirounga leonina) bull departs after lost battle, Sea Lion Island, Falkland Islands, South America

Mule deer (Odocoileus hemionus) with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

Two southern elephant seal (Mirounga leonina) bulls rear up to establish dominance, Sea Lion Island, Falkland Islands, South America

Southern elephant seal (Mirounga leonina) bull uses vocalisation and produces steam, Sea Lion Island, Falkland Islands, South America

Two bloody southern elephant seal (Mirounga leonina) bulls do battle to establish dominance, Sea Lion Island, Falkland Islands, South America

Nile crocodile (Crocodylus niliticus) on shore of Mara River with open jaws, Masai Mara National Reserve, Kenya, East Africa, Africa

Blue-footed Booby with an egg (Sula nebouxii) on North Seymour Island, Galapagos National Park, Ecuador, South America

Nazca Booby (Sula granti) with open mouth, Genovesa Island, Galapagos National Park, Ecuador, South
america

Whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

Scientist and whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Protected Area, Quintana Roo, Mexico, North America

The yellow moray eel (Gymnothorax melatremus) living in an artificial reef under an oil rig near Mabul Island, Celebes Sea, Sabah, Malaysia, Southeast Asia, Asia

Southern yellow-billed hornbill (Tockus leucomelas) with a winged predatory katydid (Clonia wahlbergi), Kruger National Park, South Africa, Africa

Immature brown pelicans (Pelecanus occidentalis) inspecting each others bills at Puerto Egas, Santiago Island, Galapagos Islands, Ecuador, South America

Bull Elk (Cervus canadensis) with the Flehmen response during the rut, Jasper National Park, Alberta, Canada, North America

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Curious flightless cormorant (Phalacrocorax harrisi) underwater at Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) hauled out at Puerto Egas, Santiago Island, Galapagos Islands, Ecuador, South America

Male southern elephant seal pups, Mirounga leonina, mock fighting in Gold Harbour, South Georgia Island, Atlantic Ocean

Lion (Panthera leo) scratching and marking territory, Serengeti National Park, Tanzania, East Africa, Africa

Chacma Baboon (Papio ursinus) baring its teeth to show aggression, Kruger National Park, South Africa, Africa

Male black wildebeest (white-tailed gnu (Connochaetes gnou) calling, Mountain Zebra National Park, South Africa, Africa

Close-up view of a three color parrotfish (Scarus tricolor), coming in for a bite of hard coral, Fiji, South Pacific, Pacific

A cleaner shrimp (Lysmata amboinensis), inspects the teeth of an undulated moray eel, Hawaii, United States of America, Pacific, North America

Atlantic bottlenose dolphins (Tursiops truncatus), feeding on small fish, United States of America, North America

Great white shark (Carcharodon carcharias), Seal Island, False Bay, Simonstown, Western Cape, South Africa, Africa

A Galapagos shark (Carcharhinus galapagensis), breaching the surface, Hawaii, United States of America, Pacific, North America

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

Four barn swallow (Hirundo rustica) chicks chirping, Custer State Park, South Dakota, United States of America, North America

A Nile crocodile (Crocodylus niloticus) resting with open mouth at the water's edge, Kwai river, Moremi Wildlife reserve, Okavango Delta, Botswana, Africa

Tourists surprised by the food in a Sichuan cuisine restaurant, Haiyongxiang District, Shanghai, China, Asia

Pallid bat (Antrozous pallidus) in captivity, Hidalgo County, New Mexico, United States of America, North America

Pallid bat (Antrozous pallidus) in captivity, Hidalgo County, New Mexico, United States of America, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Juvenile great tit (Parus major) garden bird, perched on a tree stump calling for food, Cheshire, England, United Kingdom, Europe

Swift fox (Vulpes velox) kits playing, Pawnee National Grassland, Colorado, United States of America, North America

American pika (Ochotona princeps) calling, San Juan National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) kits playing, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) vixen and kits, Pawnee National Grassland, Colorado, United States of America, North America

A captive Schneider's smooth-fronted caiman (Paleosuchus trigonatus), San Francisco Village, Loreto, Peru, South America

A captive Schneider's smooth-fronted caiman (Paleosuchus trigonatus), San Francisco Village, Loreto, Peru, South America

Male Gelada (Theropithecus gelada) in the Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Marsh Wren (Cistothorus palustris) calling, Lac Le Jeune Provincial Park, British Columbia, Canada, North America

Gaudi's multicolored mosaic salamander, popularly known as el drac (the dragon), Park Guell, UNESCO World Heritage Site, Barcelona, Catalonia, Spain, Europe

Young California sea lion (Zalophus californianus) barking, Los Islotes, Baja California Sur, Mexico, North America

Chapman's Zebra (Plains Zebra) (Equus quagga chapmani) sparring, Kruger National Park, South Africa, Africa

European Roller (Coracias garrulus) flipping a grasshopper, Kruger National Park, South Africa, Africa

Black Bear (Ursus americanus) sow and yearling cub playing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Baby Swallow-tailed Gull (Larus furcatus) on Genovesa island in Galapagos National Park, Ecuador, South America

A great barracuda (Sphyraena barracuda) comes close to the reef to be cleaned by a cleaner wrasse, Hawaii, United States of America, Pacific, North America

An Atlantic bottlenose dolphin (Tursiops truncatus) head above water, United States of America, Pacific, North America

A bluestreak cleaner wrasse searching the mouth of a clown sweetlips for parasites, Yap, Micronesia, Pacific

A great white shark (Carcharodon carcharias), breaks the surface off Guadalupe Island, Mexico, North America

Bronze lion statue outside the HSBC Bank Headquarters, rubbing its paws is said to bring good luck, Central, Hong Kong, China, Asia

Galapagos Land Iguana (Conolophus subcristatus) eating flowers, on North Seymour island, Galapagos National Park, Ecuador, South America

Yellow painted frogfish (Antennarius pictus), side profile on volcanic sand, Tulamben, Bali, Indonesia, Southeast Asia, Asia

The very capable teeth in the jaw of a stout moray (Gymnothorax eurostus), Hawaii, United States of America, Pacific, North America