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Hikers walking in front of a floating iceberg, Lake Gray, Torres del Paine National Park, Patagonia, Chile, South America

A pair of common woolly monkeys (Lagothrix lagothricha), mock fighting on the Yarapa River, Nauta, Peru, South America

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

A pair of adult Spix's night monkeys, Aotus vociferans, living in a tree within the Pacaya Samiria Preserve, Peru.

A pair of adult Spix's night monkeys, Aotus vociferans, living in a tree within the Pacaya Samiria Preserve, Peru.

A pair of adult red titi monkeys, Plecturocebus cupreus, climbing in a tree within the Pacaya Samiria Preserve, Peru.

A pair of adult Isabel's monk saki monkeys, Pithecia isabela, feeding in a tree within the Pacaya Samiria Preserve, Peru.

A pair of adult Isabel's monk saki monkeys, Pithecia isabela, feeding in a tree within the Pacaya Samiria Preserve, Peru.

A pair of mating grasshoppers, Cornops frenatum, on a leaf in the undergrowth within the Pacaya Samiria Preserve, Peru.

A pair of adult southern rough-winged swallows, Stelgidopteryx ruficollis, in a tree within the Pacaya Samiria Preserve, Peru.

A pair of adult slate-colored hawk, Leucopternis schistaceus, perched in a tree in the Pacaya Samiria Preserve, Peru.

A pair of adult slate-colored hawk, Leucopternis schistaceus, perched in a tree in the Pacaya Samiria Preserve, Peru.

A pair of adult neotropic cormorants, Phalacrocorax brasilianus, in flight within the Pacaya Samiria Preserve, Peru.

A pair of adult neotropic cormorants, Phalacrocorax brasilianus, perched within the Pacaya Samiria Preserve, Peru.

A pair of adult neotropic cormorants, Phalacrocorax brasilianus, in flight within the Pacaya Samiria Preserve, Peru.

A pair of adult neotropic cormorants, Phalacrocorax brasilianus, perched within the Pacaya Samiria Preserve, Peru.

A pair of adult horned screamers, Anhima cornuta, perched in a tree in the Pacaya Samiria Preserve, Peru.

American avocet (Recurvirostra americana) pair mating, Antelope Island State Park, Utah, United States of America, 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 robust ghost pipefish (Solenostomus cyanopterus) hover above the seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

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 harlequin shrimp (Hymenocera elegans) lie in a small recess on the seafloor of Lembeh Strait, Indonesia.

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

Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America

Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America

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

Adult southern rockhopper penguins (Eudyptes chrysocome), at breeding colony on West Point Island, Falklands, South America

Grey crowned crane (Southern crowned crane) (Balearica regulorum) pair, Ngorongoro Crater, Tanzania, East Africa, Africa

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

Author Carl Safina photographing a pair of Magellanic penguins (Spheniscus magellanicus), Patagonia, Argentina, South America

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

Greylag goose pair (Anser anser) flying over flooded pastureland, Gloucestershire, England, United Kingdom, Europe

Malachite kingfisher pair, (Corythornis cristatus), after digging in mud, Chobe National Park, Botswana

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

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

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

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

A pair of long-beaked common dolphins (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

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

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

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

Magellanic penguin (Spheniscus magellanicus) pair resting in coastal habitat, Gypsy Cove, Falkland Islands, South America

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

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

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

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

Black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis) pair, Ngorongoro Crater, Tanzania, East Africa, Africa

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

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

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

Gentoo penguin (Pygoscelis papua) pair communicating, Damoy Point, Dorian Bay, Wiencke Island, Antarctic Peninsula, Antarctica, Polar Regions

Pair of waved albatross (Diomedea irrorata), Espanola Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A pair of adult giant river otters (Pteronura brasiliensis), on the Rio Cuiaba, Mato Grosso, Pantanal, Brazil, South America

Villagers maintaining neat vegetable fields using traditional pair of oxen with wooden plough near Dadhapatna village, Odisha, India, Asia

A pair of tufted puffins (Fratercula cirrhata), South Marble Island, Glacier Bay National Park, Southeast Alaska, United States of America, North America