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East African black rhinoceros (rhinos) sparring, San Diego Wild Animal Park, California, United States of America, North 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

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

Portrait of a Tobas warrior during carnival called The Devil Dance (La Diablada), Oruro, Bolivia, South America

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

Dominant male proboscis monkey (Nasalis larvatus) on the lookout for challenges from younger males in the bachelor group, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Dominant male proboscis monkey (Nasalis larvatus) in aggressive display to other males, Labuk Bay Proboscis Monkey Sanctuary, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Two gemsbok (South African oryx) (Oryx gazella) fighting, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

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

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

Kangaroo Island grey kangaroos (Macropus fuliginosus), Lathami Conservation Park, Kangaroo Island, South Australia, Australia, Pacific

Kangaroo Island grey kangaroos (Macropus fuliginosus), Lathami Conservation Park, Kangaroo Island, South Australia, Australia, Pacific

Kangaroo Island grey kangaroos (Macropus fuliginosus), Lathami Conservation Park, Kangaroo Island, South Australia, Australia, Pacific

Two Pronghorn (Antilocapra americana) bucks sparring, Yellowstone National Park, Wyoming, United States of America, North America

Two gemsbok (South African oryx) (Oryx gazella) fighting, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

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

A close-up of the mouth of a whitemouth moray eel (Gymnothorax meleagris), showing its needle sharp teeth, United States of America, North America

Two yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) sparring, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

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

Guardians at Chumon (Central Gate), Horyu-ji Temple, dating from the 7th century and the oldest wooden building in the world, UNESCO World Heritage Site, Nara, Kansai (Western Province), Honshu, Japan, Asia

Lion (Panthera leo) carrying a blue wildebeest (brindled gnu) (Connochaetes taurinus) carcass, Masai Mara National Reserve, Kenya, East Africa, Africa

Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

Antarctic fur seal (Arctocephalus gazella) bulls establishing mating territories at the abandoned Stromness Whaling Station, South Georgia Island, South Atlantic Ocean, Polar Regions

Two bighorn sheep (Ovis canadensis) rams butting heads during the rut, Clear Creek County, Colorado, United States of America, North America

Male Thomson's gazelle (Gazella thomsonii) fighting, Masai Mara National Reserve, Kenya, East Africa, Africa

Two blue wildebeest (brindled gnu) (Connochaetes taurinus) bulls fighting, Ngorongoro Crater, Tanzania, East Africa, Africa

Northern giant petrel (Macronectes halli) posturing over dead fur seal carcass, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Northern giant petrel (Macronectes halli) fighting over dead fur seal carcass, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Two gemsbok (South African oryx) (Oryx gazella) fighting, 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

Two Common zebra (plains zebra) (Burchell's zebra) (Equus burchelli) fighting, Ngorongoro Crater, Tanzania, East Africa, Africa

Two Gentoo penguins (Pygoscelis papua) fighting on the beach, Saunders Island, Falkland Islands, South America

Southern elephant seals (Mirounga leonina), Peggotty Bluff, South Georgia, South Atlantic Ocean, Polar Regions

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

Antarctic fur seal (Arctocephalus gazella) bulls establishing mating territories at the abandoned Stromness Whaling Station, South Georgia Island, South Atlantic Ocean, Polar Regions

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

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

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

Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

Southern elephant seals (Mirounga leonina) hauled out for their annual catastrophic moult, Snow Island, Antarctica, Polar Regions

Southern elephant seals (Mirounga leonina) hauled out for their annual catastrophic moult, Snow Island, Antarctica, Polar Regions

Southern elephant seal (Mirounga leonina) bull, Peggotty Bluff, South Georgia, South Atlantic Ocean, Polar Regions

Northern giant petrel (Macronectes halli) fighting over dead fur seal carcass, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

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

Two blesbok (Damaliscus pygargus phillipsi) facing off, Mountain Zebra National Park, South Africa, Africa

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Bison (Bison bison) bulls sparring, Custer State Park, South Dakota, United States of America, North America

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Two sub-adult grizzly bears (Ursus arctos horribilis), Glacier National Park, Montana, United States of America, North America

Bison (Bison bison) cows sparring, Yellowstone National Park, Wyoming, United States of America, North America

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

Northern giant petrel (Macronectes halli) fighting over dead fur seal carcass, Gold Harbour, South Georgia, South Atlantic Ocean, Polar Regions

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting, Genovesa Island, Galapagos Islands, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Bison (Bison bison) bulls sparring, Custer State Park, South Dakota, United States of America, North America

Two bull elk (Cervus canadensis) sparring during the rut, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Antarctic fur seal (Arctocephalus gazella) bulls establishing mating territories at the abandoned Stromness Whaling Station, South Georgia Island, South Atlantic Ocean, Polar Regions

Two African elephant (Loxodonta africana) sparring, Serengeti National Park, Tanzania, East Africa, Africa

Southern elephant seal (Mirounga leonina) bulls fighting for territory for mating, Gold Harbour, South Georgia, UK Overseas Protectorate, Polar Regions

Baby Siberian lynx or Eurasian lynx (Lynx lynx) in captivity, Animals of Montana, Bozeman, Montana, United States of America, North America

Springbok (Antidorcas marsupialis) sparring at sunset, Kgalagadi Transfrontier Park, Northern Cape, South Africa, Africa

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

Two male red hartebeest (Alcelaphus buselaphus) sparring, Mountain Zebra National Park, South Africa, Africa

Great white shark (Carcharodon carcharias), breaching to decoy, Seal Island, False Bay, Cape Town, South Africa, Africa

Great white shark (Carcharodon carcharias), breaching, Seal Island, False Bay, Cape Town, South Africa, Africa

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre