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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 common squirrel monkeys, Saimiri sciureus, climbing 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 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 beautiful nudibranchs (Hypselodoris tryoni) crawl along the seafloor near Alor in the Lesser Sunda Islands of Indonesia.

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.

A pair of vibrant nudibranchs, Nembrotha kubaryana, mate on a coral reef in 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

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

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

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

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

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

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

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

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

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 pair of moon jellyfish (Aurelia sp), in Jellyfish Lake, located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

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

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

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

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

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