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A pair of Atlantic Puffins (Fratercula arctica), on a hilltop in Borgarfjaroarhofn, Iceland, Polar Regions

A pair of Atlantic Puffins (Fratercula arctica), on a cliff edge in Westman Islands, Iceland, Polar Regions

Adult Nazca booby (Sula grantii) pair in courtship in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A pair of manatees appear to be greeting each other as they meet in the clear freshwater of the Fanning Spring inlet to the Suwannee River in Fanning Springs, Florida.

A pair of manatees swimming in formation with the lead manatee in the crystal clear freshwater of the Fanning Springs inlet to the Suwannee River, Florida.

A Sheepshead looks on as a pair of Blue Angelfish appear to be confused on which direction to go but each are feeding on different parts of coral and algae covered jetty rocks at St. Andrew Bay channel wall in Panama City Beach, Florida.

Pair of pink skunk clownfish (Amphiprion perideraion) nestled in a round bright orange anemone, Manado, North Sulawesi, Indonesia.

Pair of Caribbean reef sharks (Carcharhinus perezi) swimming along the reef, Jardines De La Reina, Cuba.

Pair of orange and red christmas tree worms on top of yellow hard coral, Pulau Aur, Johor, Malaysia.

Pair of Chromodoris annae nudibranch with brilliant blue and yellow skirt, crawling over green and pink coral, Anilao, Batangas, Philippines.

A pair of oceanic blacktip sharks with remora in tow pass each other by in a cloud of silvery fish, Aliwal Shoal, Umkomaas, KwaZulu-Natal, South Africa.

A pair of lappet-faced vultures (Torgos tracheliotos), in the great migration, Serengeti National Park, Tanzania, East Africa, Africa

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

Magellanic penguins (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

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Pair of Scarlet Macaw (Ara macao), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

A pair of spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Man ploughing rice paddy with pair of bullocks, ready for planting new crop of rice, family helping, Tamil Nadu, India, Asia

Man ploughing rice paddy with pair of bullocks, ready for planting new crop of rice, Tamil Nadu, India, Asia

Brown noddy (Anous stolidus) pair at nest site on Floreana 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 San Cristobal Island, Galapagos, Ecuador, South America

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

Nazca booby (Sula granti), pair at Punta Suarez, Isla Espanola, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Gentoo penguin (Pygoscelis papua) pair, changing places on nest, Damoy Point, Wiencke Island, Antarctic Peninsula, Antarctica, Polar Regions

A pair of least chipmunks (Neotamias minimus), at Phelps Lake, Grand Teton National Park, Wyoming, United States of America, North America

Eurasian Badger (Meles meles) adult, pair standing beside each other, coppice woodland habitat, Kent, England, United Kingdom, Europe

A pair of adult bull Antarctic fur seals (Arctocephalus gazella), fighting in Right Whale Bay, South Georgia, South Atlantic, Polar Regions

Breeding pair of Shags (Gulosus aristotelis) by their nest on cliffs at Braes peninsula, a red listed bird, The Braes, Portree, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

A Shelduck (Tadorna tadorna) pair, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Mated bald eagle (Haliaeetus leucocephalus) pair on nest near the Brooks River, Katmai National Park, Alaska, United States of America

Adult Atlantic puffins (Fratercula arctica), breeding on the island of Bolscheoya in the Svalbard Archipelago, Norway

Brunnichs guillemot (Uria lomvia) pair taking flight at Cape Fanshawe in the Svalbard Archipelago, Norway

Upper Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, USA, North America

A pair of colorful tunicates grows on a reef in Lembeh Strait, Indonesia. This is a filter-feeding organism.

A pair of spotted eagle rays (Aetobatus narinari) swim over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A pair of beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

A pair of vibrant nudibranchs, Nembrotha kubaryana, mate on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

Rock shag (Phalacrocorax magellanicus), pair exhibiting courtship behavior near New Island in the Falkland Islands, South America

Antarctic shag (Phalacrocorax atriceps bransfieldensis), pair on nest at breeding site at Jougla Point, Antarctica, Polar Regions

Adult snowy sheathbill (Chionis albus), pair in front of the hut at Port Lockroy, Antarctica, Southern Ocean, Polar Regions

Adult brown bear pair (Ursus arctos) fishing for pink salmon at Pavlof Harbor on Chichagof Island, Southeast Alaska, United States of America, North America

Adult Nazca booby (Sula grantii) pair in courtship in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A pair of hooded orioles (Icterus cucullatus), in courtship, San Jose del Cabo, Baja California Sur, Sea of Cortez, Mexico, North America

Adult dovekie (Alle alle alle) breeding area on the island of Bolscheoya in the Svalbard Archipelago, Norway

Yellow-billed stork (Mycteria ibis), Chobe River, Botswana, Africa, mating pair at nest site, at nest colony

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Magellanic penguin (Spheniscus magellanicus), a pair of breeding penguins on their nest, Patagonia, Chile, South America

A pair of humpback whales (Megaptera novaeangliae), underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Secretarybird (Sagittarius serpentarius) pair building a nest atop an acacia tree, Masai Mara National Reserve, Kenya, East Africa, Africa

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.

A pair of Chromodoris annae nudibranch crawl on a large tunicate among the remote, tropical islands of Raja Ampat, Indonesia.

Adult black-browed albatross (Thalassarche melanophrys), pair in courtship display at nesting site on New Island, Falklands, South America