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Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) mating in the surf at Gold Harbour on South Georgia Island, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Adult black-legged kittiwake (Rissa tridactyla) in combat with a second kittiwake near Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult chinstrap penguins (Pygoscelis antarctica), mating at breeding colony on Half Moon Island, Antarctica, Polar Regions

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension island, South Atlantic Ocean

Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Australasian gannet (Morus serrator) courtship display at Cape Kidnappers, North Island, New Zealand, Pacific

Couple of Great black-backed gulls in the cliffs of Etretat, Seine Maritime department, Normandy region, France, Europe

King penguin (Aptenodytes patagonicus) breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Adult chinstrap penguins (Pygoscelis antarctica) mating at Baily Head on Deception 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

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Captive Galapagos giant tortoises (Chelonoidis spp), Charles Darwin Research Station, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Southern elephant seal (Mirounga leonina) bull holding female down for mating, Right Whale Bay, South Georgia, UK Overseas Protectorate, Polar Regions

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Imperial Shags (Phalacrocorax (atriceps) atriceps) at breeding colony on small islets off the city of Ushuaia, Argentina, 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

Gentoo penguin pair (Pygoscelis papua), mating at breeding colony site on Cuverville Island, Antarctica, Polar Regions

Black-shouldered kite (Elanus caeruleus) pair mating, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Lion (Panthera leo) pair mating, Kgalagadi Transfrontier Park, the former Kalahari Gemsbok National Park, South Africa

Mating Antarctic fur seals (Arctocephalus gazella), in the water at Hercules Bay, South Georgia Island, Polar Regions

Adult Hector's dolphin (Cephalorhynchus hectori) mating near Akaroa, South Island, New Zealand, Pacific

Gentoo penguins (Pygoscelis papua), mating at breeding colony on Barrientos Island, Antarctica, Polar Regions

A small pod of beluga whales (Delphinapterus leucas), consisting of several males and one lone female mating, Svalbard, Norway, Europe

Azure damselfly (Coenagrion puella) pair mating and casting shadow on a leaf, Wiltshire, England, United Kingdom, Europe

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

Lion (Panthera leo) mating, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Bull mounting cow in herd of cattle by Maiden Moor in Derwent Fells, Cumbrian mountains in Lake District National Park, UK

King penguin (Aptenodytes patagonica) pair pre-mating behaviour, Salisbury Plain, South Georgia, Polar Regions

Mating of common octopus (Octopus vulgaris), Cap de Creus, Costa Brava, Spain, Mediterranean, Europe

Moose, alces alces. In fall; female/cow and male/ bull; in mating season tundra in fall colour north america

Atlas moth (Attacus atlas) mating. Balikpapan Bay, East Kalimantan, Borneo, Indonesia, Southeast Asia, Asia

Short-beaked common dolphins (Delphinus delphis), mating behaviour, west of Faial Island, Azores, Atlantic Ocean, Portugal, Europe

Mating crane flies (Tipulidae), Bettel, Luxembourg, EuropeOrder Diptera (True flies);Sub-order Nematocera

Mating of common octopus (Octopus vulgaris), Cap de Creus, Costa Brava, Spain, Mediterranean, Europe

Pair of mandarinfish (Synchiropus splendidus) displaying spawning behaviour, Malapascua, Cebu, Philippines, Visayan Sea, Southeast Asia, Asia

Pair of mandarinfish (Synchiropus splendidus) mating, Malapascua, Cebu, Philippines, Visayan Sea, Southeast Asia, Asia

Frog (Chaunus (Bufo) crucifer) copulating with female in captivity, Herpetology laboratory at University of Sao Paulo, Sao Paulo, Brazil, South America

Pair of mandarinfish (Synchiropus splendidus) mating, Malapascua, Cebu, Philippines, Visayan Sea, Southeast Asia, Asia

Adult gentoo penguins (Pygoscelis papua) mating on Barrentos Island in the Aitchi Island Group, South Shetland Islands, Antarctica

Heermann's Gull (Larus heermanni) mating ritual on their breeding grounds on Isla Rasa in the middle Gulf of California (Sea of Cortez), Mexico

Adult waved albatross (Diomedea irrorata) at breeding colony on Espanola Island in the Galapagos Island Archipelago, Ecuador

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Adult green sea turtles (Chelonia mydas agassizii) mating (male on top of female) in the waters surrounding the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.

King penguin (Aptenodytes patagonicus) mating behavior at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean.

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Adult male magnificent frigatebird (Fregata magnificens) near breeding colony on Isla Magdalena, Bahia de Magdalena, Baja California Sur, Mexico.

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern Ocean

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern Ocean