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Adult Spix's night monkeys (Aotus vociferans), in Nauta Cano, Amazon River Basin, Iquitos, Peru, South America

An adult olive whipsnake (Chironius fuscus), swimming in Belluda Creek, Ucayali River, Loreto, Peru, South America

Adult brown-throated sloth (Bradypus variegatus), three toe detail, San Francisco, Amazon Basin, Loreto, Peru, South America

Mother and baby brown-throated sloths (Bradypus variegatus), San Francisco, Amazon Basin, Loreto, Peru, South America

A young spectacled caiman (Caiman crocodilus) at night on Rio El Dorado, Ucayali River, Amazon Basin, Loreto, Peru, South America

Baby brown-throated sloth (Bradypus variegatus), San Francisco, Amazon Basin, Loreto, Peru, South America

Adult brown-throated sloth (Bradypus variegatus), Yanayacu Lake, Rio Pacaya, Amazon Basin, Loreto, Peru, South America

An adult female cream-colored woodpecker (Celeus flavus), Lake Clavero, Amazon Basin, Loreto, Peru, South America

An adult female cream-colored woodpecker (Celeus flavus), Lake Clavero, Amazon Basin, Loreto, Peru, South America

Adult yellow-rumped caciques (Cacicus cela), at nest site on Belluda Cano, Amazon Basin, Loreto, Peru, South America

A wild adult male bee hummingbird (Mellisuga helenae), attracted to hand-held flower near Playa Larga, Cuba, West Indies, Caribbean, Central America

A wild adult male bee hummingbird (Mellisuga helenae), displaying vivid coloration near Playa Larga, Cuba, West Indies, Caribbean, Central America

A confusion of blue wildebeest (brindled gnu) (Connochaetes taurinus), on the Great Migration, Serengeti National Park, Tanzania, East Africa, Africa

A juvenile lilac-breasted roller (Coracias caudatus), Tarangire National Park, Tanzania, East Africa, Africa

Captive Desmarest's hutia (Capromys pilorides) (Cuban hutia), a species of rodent endemic to Cuba, West Indies, Central America

Adult bull Galapagos fur seal (Arctocephalus galapagoensis) underwater on Genovesa Island, Galapagos, Ecuador, South America

Pacific green sea turtle (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

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

Adult Great blue heron (Ardea herodias), in the town of Puerto Baquerizo Moreno, Isla San Cristobal, Galapagos, Ecuador, South America

An adult Galapagos land iguana (Conolophus subcristatus), head detail, North Seymour Island, Galapagos, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) with cow on Santa Cruz Island, Galapagos, Ecuador, South America

Pacific green sea turtles (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

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

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

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

Adult blue-footed booby (Sula nebouxii), feet detail 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

Galapagos penguins (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

Bull Galapagos sea lion (Zalophus wollebaeki) with snorkeler underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

Adult male great frigatebird (Fregata minor), courtship display. Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Endemic lava cactus (Brachycereus spp), Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus), with lava lizard, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult male great frigatebirds (Fregata minor), courtship display. Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus), feeding underwater, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) basking on Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) basking on Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus), face detail, Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) basking on Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult waved albatross (Phoebastria irrorata), on Punta Suarez, Isla Espanola, Galapagos, UNESCO World Heritage Site, Ecuador, South America

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

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

Male lava lizard (Microlophus spp), on North Seymour Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult Sally lightfoot crab (Grapsus grapsus) preparing to molt on Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula), on Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult Sally lightfoot crab (Grapsus grapsus), preparing to molt on Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

California gray whale (Eschrichtius robustus), spy-hopping in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale (Eschrichtius robustus), flukes up dive in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Open Sonoran desert at sunset near Mision de San Francisco de Borja, Baja California, Mexico, North America

California gray whale calf (Eschrichtius robustus) underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki), pup in Puerto Egas, Santiago Island, Galapagos, Ecuador, South America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

An adult brown bear (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Commercial fishing boats of all kinds and sizes in Homer Harbor in Kachemak Bay, Kenai Peninsula, Alaska, United States of America, North America

An adult Arctic ground squirrel (Urocitellus parryii) feeding in the brush at Denali National Park, Alaska, United States of America, North America

An adult bull porcupine caribou (Rangifer tarandus granti), hiding in fall color changes in Denali National Park, Alaska, United States of America, North America

Adult green iguana (Iguana iguana), basking on the banks of the Rio Tres Irmao, Mato Grosso, Pantanal, Brazil, South America

Humpback whale (Megaptera novaeangliae), male breaching on the Silver Banks, Dominican Republic, Greater Antilles, Caribbean, Central America

Adult bottlenose dolphin (Tursiops truncatus), bow riding the tender on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

African bush elephants (Loxodonta africana), taking a dust bath, Tarangire National Park, Tanzania, East Africa, Africa

Joshua trees, Yucca brevifolia, amongst weathered rocks in Joshua Tree National Park, California, USA.

Humpback whale (Megaptera novaeangliae), mother and calf underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Remains of the Kinsei Maru shipwreck on the northeast side of the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Excited tourists watching and photographing jaguars on the Rio Negro, Mato Grosso, Pantanal, Brazil, South America

Long exposure astrophotography showing the stars and the northern lights in Denali National Park, Alaska, United States of America, North America

Transient killer whale (Orcinus orca) breaching in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

Stranded ice on the low tide in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, Alaska, United States of America, North America

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

Lamplugh Glacier, a tidewater glacier in Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Auke Bay as seen from a small private plane flying from Juneau to Gustavus, Southeast Alaska, United States of America, North America

A mother sea otter (Enhydra lutris) with her pup in Reid Inlet, Glacier Bay National Park, Southeast Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Adult female elk (Cervus canadensis) on String Lake, Grand Teton National Park, Wyoming, United States of America, North America

Stand up paddle boarders on String Lake, Grand Teton National Park, Wyoming, United States of America, North America

Adult Canada geese (Branta canadensis) with goslings, Gros Ventre River, Grand Teton National Park, Wyoming, United States of America, North America

Snow-capped mountains reflected in the calm waters of String Lake, Grand Teton National Park, Wyoming, United States of America, North America

Stand up paddle boarders on String Lake, Grand Teton National Park, Wyoming, United States of America, North America

Adult female Common merganser (Mergus merganser), with chicks, Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

Adult mother red fox (Vulpes vulpes), near her den at Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

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

Young mule deer (Odocoileus hemionus) buck in velvet, Gros Ventre, Grand Teton National Park, Wyoming, United States of America, North America

An adult American red squirrel (Tamiasciurus hudsonicus), Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

Adult Yellow-bellied marmot (Marmota flaviventris) feeding at Phelps Lake, Grand Teton National Park, Wyoming, United States of America, North America

Adult female Common merganser (Mergus merganser) with chicks, Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

Young mule deer (Odocoileus hemionus) buck in velvet, Gros Ventre, Grand Teton National Park, Wyoming, United States of America, North America

Red fox kit (Vulpes vulpes), about two months old near its den at Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America