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Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina
Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina
Adult brown bear pair (Ursus arctos) exhibiting courtship behavior at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America
Yellow-billed stork (Mycteria ibis), Chobe River, Botswana, Africa, mating pair at nest site, at nest colony
Adult whooper swan (Cygnus cygnus), pair on nest near Lake Myvatn, Iceland
Adult whooper swan (Cygnus cygnus), pair on nest near Lake Myvatn, Iceland
Adult Eurasian oystercatcher (Haematopus ostralegus ostralegus) in full breeding plumage at Isfjardardjup, Iceland
Adult red-necked phalaropes (Phalaropus lobatus) in breeding plumage on Flatey Island, Iceland
Adult red-necked phalaropes (Phalaropus lobatus) in breeding plumage on Flatey Island, Iceland
Southern elephant seals (Mirounga leonina) mating, St. Andrews Bay, South Georgia, Polar Regions
Gentoo penguins (Pygoscelis Papua), performing a mating ritual in the Antarctic peninsula, Antarctica, Polar Regions
Adult broadclub cuttlefish (Sepia latimanus) mating on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia
Blue-footed booby (Sula nebouxii) pair in courtship display on San Cristobal Island, Galapagos, Ecuador, South America
Blue-footed booby (Sula nebouxii) pair in courtship display on San Cristobal Island, Galapagos, Ecuador, South America
Blue-footed booby (Sula nebouxii) pair in courtship display on North Seymour Island, Galapagos, Ecuador, South America
A male and female lion (Panthera leo) mating in Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Wild male plains bison courts a female during the mating season, Elk Island National Park, Alberta, Canada, North America
Chinstrap Penguins mating in Antarctica, Polar Regions
Wild male plains bison during the mating season, Elk Island National Park, Alberta, Canada, North America
Rocky mountain bighorn ram (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
Adult black-browed albatross (Thalassarche melanophrys), pair in courtship display at nesting site on New Island, Falklands, South America
Adult Nazca booby (Sula grantii) with downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
King penguins (Aptenodytes patagonicus) on the beach at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions
King penguins (Aptenodytes patagonicus) at breeding and nesting colony at Right Whale Bay, South Georgia, Polar Regions
Adult southern rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony, Falkland Islands, South America
Neotropic cormorant (Phalacrocorax brasilianus) (Phalacrocorax olivaceus) (Nannopterum brasilianum), Lake Sandoval, Tambopata National Reserve, Peru, South America
King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions
Adult king penguin (Aptenodytes patagonicus) in the act of feeding chick on South Georgia Island, Southern Ocean, Polar Regions
King penguin (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions
Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead fur seal pup at St. Andrews Bay, South Georgia
Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Dead southern elephant seal (Mirounga leonina) pup being eaten by an Antarctic skua on South Georgia Island, Southern Ocean
Adult Grey-headed Albatross (Thalassarche chrysostoma) courtship display at Elsehul, South Georgia
Blue footed booby (sula nebouxii) incubating eggs at Punta Pitt, San Cristobal Island, Galapagos, UNESCO, Ecuador
Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands
Male and female Red-legged Honeycreeper (Cyanerpes cyaneus) on a branch, Costa Rica
Rocky mountain bighorn rams headbutting (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
King penguins (Aptenodytes patagonicus) in mating ritual, Volunteer Point, East Falkland, Falkland Islands, South Atlantic, South America
Southern elephant seal (Mirounga leonina), beachmaster bull with female harem, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions
A pair of vibrant nudibranchs, Nembrotha kubaryana, mate on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.
An orangethroat pike blenny (Chaenopsis alepidota), displays its colors in hopes of attracting a mate, Sea of Cortez.
A pair of cuttlefish mating over a coral reef, Raja Ampat, Indonesia.
Three male Indo-Pacific bottlenose dolphins (Tursiops aduncus), and one female dolphin breeding, Red Sea.
Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America
Adult southern rockhopper penguins (Eudyptes chrysocome), at breeding colony on West Point Island, Falklands, South America
Beachmaster bull southern elephant seal (Mirounga leonina) attempting to mate at Peggotty Bluff, South Georgia, Polar Regions
Antarctic shag (Phalacrocorax atriceps bransfieldensis), pair on nest at breeding site at Jougla Point, Antarctica, Polar Regions
Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions
Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions
Firebug (Pyrrhocoris apterus), France, Europe
Adult black-legged kittiwake (Rissa tridactyla) in aerial combat against another kittiwake near Alexander Island, Russia, Eurasia
Adult gentoo penguins (Pygoscelis papua), squabble at Booth Island, Antarctica, Southern Ocean, Polar Regions
Chinstrap penguins (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions
Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe
Painted Locust (Schistocerca melanocera) mating in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions
Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions
Adult Magellanic penguins (Spheniscus magellanicus) at breeding and molting site on Carcass Island, Falkland Islands, South America
Southern elephant seals (Mirounga leonina) hauled out and molting on Hannah Point, Livingston Island, Antarctica, Polar Regions
Chinstrap penguin (Pygoscelis antarctica) breeding and molting at Half Moon Island, Antarctica, Southern Ocean, Polar Regions
The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Gentoo penguin (Pygoscelis papua) mating behavior at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions
King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions
King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions
Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia
Adult bull southern elephant seal (Mirounga leonina) flipping sand onto its back to cool off on South Georgia Island, Southern Ocean
Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean
Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands
Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands
Mated bald eagle (Haliaeetus leucocephalus) pair on nest near the Brooks River, Katmai National Park, Alaska, United States of America
Adult brown bears (Ursus arctos) courtship behaviour, Brooks River, Katmai National Park near Bristol Bay, Alaska, United States of America
Adult arctic tern (Sterna paradisaea) male bringing female a fish, Spitsbergen Island in the Svalbard Archipelago, Norway
Adult arctic tern (Sterna paradisaea) male bringing female a fish, Spitsbergen Island in the Svalbard Archipelago, Norway
Mother polar bear (Ursus maritimus) and cub-of-the-year disputing then allowing a male bear to feed on a fin whale, Svalbard Archipelago, Norway
Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America
Southern elephant seal (Mirounga leonina) bull holding female down for mating, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions
Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions
Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions
Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America
Adult gentoo penguin (Pygoscelis papua), mating at Booth Island, Antarctica, Southern Ocean, Polar Regions
Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension island, South Atlantic Ocean
Hamerkop (Scopus umbretta) carrying nesting material, Zimanga Game Reserve, South Africa, Africa
Adult chinstrap penguins (Pygoscelis antarctica) mating at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions
Gentoo penguin (Pygoscelis papua) mating behavior at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions
Antarctic fur seal bulls (Arctocephalus gazella) fighting for mating territory on South Georgia, Southern Ocean, Polar Regions
Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean
Blue-footed booby (Sula nebouxii) pair in courtship display on North Seymour Island, Galapagos, Ecuador, South America
A male lion wooing a female (Panthera leo) before mating in Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa
Wild male plains bison during the mating season, Elk Island National Park, Alberta, Canada, North America
A pair of mandarinfish mating, Cebu, Philippines.
A pair of Ceylon nudibranchs (Gymnodoris ceylonica) mate on a sandy slope in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.
Two mandarinfish spawn and release eggs, Anilao, Philippines.
Australasian gannet (Morus serrator) courtship display at Cape Kidnappers, North Island, New Zealand, Pacific