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Adult black-legged kittiwake (Rissa tridactyla) in aerial combat against another kittiwake near Alexander Island, Russia, Eurasia

Adult black-legged kittiwakes (Rissa tridactyla) in flight in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Adult great skua (Stercorarius skua) with recent kill in the Svalbard Archipelago, Norway, Arctic, Europe

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird of the Americas that feeds on crustacea, Bermuda, Atlantic

Broad-winged hawk (Buteo platypterus) small raptor, common in the Americas as far south as Brazil, Playa Garza, Nosara, Guanacaste, Costa Rica

An adult Pacific reef heron (Egretta sacra), hunting for prey on Montgomery Reef, Kimberley, Western Australia, Australia, Pacific

Adult bald eagle (Haliaeetus leucocephalus) perched in Sitka spruce tree, Southeast Alaska, United States of America

Adult bald eagle (Haliaeetus leucocephalus) with dead salmon in Inian Pass, Southeast Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on salmon at Iyoukeen Cove on Chichagof Island, 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 brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Young brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

A mother polar bear (Ursus maritimus), and cub of the year leaving a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Two young polar bears (Ursus maritimus), feeding side-by-side on a fresh bearded seal kill on Spitsbergen, Svalbard, Norway

Two young polar bears (Ursus maritimus), feeding side-by-side on a fresh bearded seal kill on Spitsbergen, Svalbard, Norway

A mother polar bear (Ursus maritimus), and cub of the year feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

A mother polar bear (Ursus maritimus), and cub of the year feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Mother polar bear (Ursus maritimus) and cub-of-the-year disputing then allowing a male bear to feed on a fin whale, Svalbard Archipelago, Norway

Adult male polar bear (Ursus maritimus) drawn to a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Two mother polar bears (Ursus maritimus) with cubs of the year watch a male bear feeding on a fin whale carcass in Svalbard, Norway

A mother polar bear (Ursus maritimus), with cub of the year feeding on a fin whale carcass in Holmabukta, Svalbard, Norway

Group of at least eight killer whales (Orcinus orca) surfacing off the coast of the island of Surtsey, southern Iceland

An adult anhinga (Anhinga anhinga), taking flight on New River near the Mesoamerican archaeological site of Lamanai, Belize

Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Black-legged kittiwake (Rissa tridactyla) feeding on small fish in Tracy Arm, Southeast Alaska, United States of America, North America

Adult glaucous gull (Larus hyperboreus) eating common eider duckling (Somateria mollissima) in Svalbard, Norway, Arctic, Europe

Adult female leopard seal (Hydrurga leptonyx) killing and eating a juvenile Adelie penguin at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

An adult Pacific reef heron (Egretta sacra), hunting for prey on Montgomery Reef, Kimberley, Western Australia, Australia, Pacific

Adult Patagonian crested ducks (Lophonetta specularioides specularioides) feeding at low tide on Carcass Island, Falkland Islands

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult polar bear (Ursus maritimus) with a freshly killed ringed seal, PUnited States of America hispida, in the Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus), on a fresh bearded seal kill near Monacobreen Glacier, Svalbard, Norway

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

Two young polar bears (Ursus maritimus), feeding side-by-side on a fresh bearded seal kill on Spitsbergen, Svalbard, Norway

A mother polar bear (Ursus maritimus), and cub of the year feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus), swimming to the smell of a fresh bearded seal kill in SpitsBergen, Vestland, Norway

Pack Ice Type B killer whales (Orcinus orca), finding a leopard seal (Hydrurga leptonyx), on an ice floe in Antarctica, Polar Regions

Small pod of eight to ten 'Type A' Oceanic killer whales (Orcinus orca), hunting near Stanley, Falkland Islands, South America

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, 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 arctic tern (Sterna paradisaea) feeding on small fish on Spitsbergen Island in the Svalbard Archipelago, Norway, Arctic, Europe

An old, emaciated adult male polar bear (Ursus maritimus) desperately searching for food in the Svalbard Archipelago, Norway, Arctic, Europe

Adult female leopard seal (Hydrurga leptonyx) stalking juvenile Adelie penguins on ice at Brown Bluff, Antarctic Peninsula.