Arctic tern (Sterna paradisaea), with fish, Farne Islands, Northumberland coast, England, United Kingdom, Europe

Robin (Erithacus rubecula), in snow, United Kingdom, Europe

Western meadowlark (Sturnella neglecta), Antelope Island State Park, Utah, United States of America, North America

Greater Roadrunner (Geococcyx californianus), Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Woolly-necked Stork (Ciconia episcopus), Imfolozi Game Reserve, South Africa, Africa

Male Lesser Masked Weaver (Ploceus intermedius), Kruger National Park, South Africa, Africa

Cattle Egret (Bubulcus ibis), Kruger National Park, South Africa, Africa

Female ladder-backed woodpecker (Picoides scalaris), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Song sparrow (Melospiza melodiai), Sidney Spit, British Columbia, Canada, North America

Little Bee-Eater (Merops pusillus), Masai Mara National Reserve, Kenya, East Africa, Africa

Male Black-Bellied Bustard (Black-Bellied Korhaan) (Eupodotis melanogaster), Masai Mara National Reserve, Kenya, East Africa, Africa

Semipalmated sandpiper (Calidris pusilla) wading while feeding, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Western kingbird (Tyrannus verticalis), Okanogan County, Washington State, United States of America, North America

Blacksmith Plover or Blacksmith Lapwing (Vanellus armatus), Kruger National Park, South Africa, Africa

Common Raven (Corvus corax), Bryce Canyon National Park, Utah, United States of America, North America

Arctic tern (Sterna paradisaea), with fish, Farne Islands, Northumberland coast, England, United Kingdom, Europe

Willet (Tringa semipalmata) in breeding plumage stretching its wings, Antelope Island State Park, Utah, United States of America, North America

Violet-green swallow (Tachycineta thalassina), Sidney Spit, British Columbia, Canada, North America

Verreaux's (Giant) eagle owl (Bubo lacteus), Kgalagadi Transfrontier Park, South Africa, Africa

American White Pelican (Pelecanus erythrorhynchos), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Two Sandhill Cranes (Grus canadensis) in flight in late afternoon light, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Greater Roadrunner (Geococcyx californianus), Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Robin (Erithacus rubecula), in snow, United Kingdom, Europe

House sparrow (Passer domesticus), United Kingdom, Europe

Malachite Kingfisher (Alcedo cristata), Masai Mara National Reserve, Kenya, East Africa, Africa

Marabou Stork (Leptoptilos crumeniferus), Kruger National Park, South Africa, Africa

Eastern kingbird (Tyrannus tyrannus), Pawnee National Grassland, Colorado, United States of America, North America

Female house finch (Carpodacus mexicanus), near Saanich, British Columbia, Canada, North America

Red-necked grebe (Podiceps grisegena), Wasilla, Alaska, United States of America, North America

Ferruginous Hawk (Buteo regalis) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

Green-Naped Lorikeet (Trichoglossus haematodus haematodus) in captivity, Denver Zoo, Denver, Colorado, United States of America, North America

American Avocet (Recurvirostra americana), Belmar Historic Park, Lakewood, Colorado, United States of America, North America

Oregon Junco (Junco hyemalis oreganus), a Dark-Eyed Junco (Junco hyemalis), Roxborough State Park, Colorado, United States of America, North America

Secretarybird (Sagittarius serpentarius) at roost, Kgalagadi Transfrontier Park, South Africa, Africa

Juvenile gray-crowned rosy-finch (Leucosticte tephrocotis), Glacier National Park, Montana, United States of America, North America

Lappetfaced vulture (Torgos tracheliotus), Etosha National Park, Namibia, Africa

Male Black-Bellied Bustard (Black-Bellied Korhaan) (Eupodotis melanogaster), Masai Mara National Reserve, Kenya, East Africa, Africa

Southern Ground-Hornbill (Ground Hornbill) (Bucorvus leadbeateri) with prey, Kruger National Park, South Africa, Africa

Common snipe (Gallinago gallinago), Arapaho National Wildlife Refuge, Colorado, United States of America, North America

Northern Shoveler (Anas clypeata) hen in flight, Antelope Island State Park, Utah, United States of America, North America

Ring-billed gull (Larus delawarensis) on the water, Farmington Bay, Utah, United States of America, North America

Clark's nutcracker (Nucifraga columbiana), Manning Provincial Park, British Columbia, Canada, North America

Red-Necked Spurfowl (Red-Necked Francolin) (Francolinus afer) (Pternistes afer), Masai Mara National Reserve, Kenya, East Africa, Africa

Double-Crested Cormorant (Phalacrocorax auritus) in flight with nesting material, Denver City Park, Denver, Colorado, United States of America, North America

Canada goose (Branta canadensis) swimming, Esquimalt Lagoon, Saanich, British Columbia, Canada, North America

Slate-colored junco (Junco hyemalis hyemalis), dark-eyed junco (Junco hyemalis), Wasilla, Alaska, United States of America, North America

Sandhill Crane (Grus canadensis) just about to land, Bernardo Wildlife Area, Ladd S. Gordon Wildlife Complex, New Mexico, United States of America, North America

Red-Breasted Swallow (Hirundo semirufa), Hluhluwe Game Reserve, South Africa, Africa

Lilac breasted roller (Coracias caudata) in tree, Etosha National Park, Namibia, Africa

African Fish Eagle (Haliaeetus vocifer), Kruger National Park, South Africa, Africa

Yellow-eyed junco (Junco phaeonotus), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Tree swallow (Tachycineta bicolor), near Oliver, British Columbia, Canada, North America

Curve-billed Thrasher (Toxostoma curvirostre), Caballo Lake State Park, New Mexico, United States of America, North America

Ruff (Philomachus pugnax), Kruger National Park, South Africa, Africa

Grey-Backed Fiscal (Lanius excubitoroides), Masai Mara National Reserve, Kenya, East Africa, Africa

Silhouetted Sandhill Crane (Grus canadensis) in flight at sunset, Bernardo Wildlife Area, Ladd S. Gordon Wildlife Complex, New Mexico, United States of America, North America

Gilded Flicker (Colaptes chrysoides) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

Egyptian Goose (Alopochen aegyptiacus), Kruger National Park, South Africa, Africa

African Spoonbill (Platalea alba), Kruger National Park, South Africa, Africa

Grey heron (Ardea cinerea), Etosha National Park, Namibia, Africa

Greater roadrunner (Geococcyx californianus), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Short-Billed Dowitcher (Limnodromus griseus) reflected at sunset, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Great Egret (Ardea alba) with a fish, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Greater Blue-Eared Glossy Starling (Lamprotornis chalybaeus), Kruger National Park, South Africa, Africa

White-Tailed Ptarmigan (Lagopus leucurus) in mixed plumage, Mount Evans, Colorado, United States of America, North America

Fiscal Shrike (Common Fiscal) (Lanius collaris), Addo Elephant National Park, South Africa, Africa

African fish eagle (Haliaeetus vocifer), Masai Mara, Kenya, East Africa, Africa

Budgerigar perched on branch, Queensland, Australia

Mealy parrot (Amazona farinosa) is one of the largest Amazon parrot species, in captivity in the United Kingdom, Europe

Guano in an Adelie Penguin, Pygoscelis adeliae, colony at Madder Cliffs, Suspiros Bay, at the west end of Joinville Island, Antarctica. Adelie's are a true Antarctic species which are suffering as a result of climate change, The Antarctic Peninsular, their only breeding grounds, is one of the fastest warming areas on the planet. This is causing Adelies to migrate south. They are reducing in numbers, they feed almost exclusively on Krill, which is also declining as a result of climate change.

A South Georgia Pintail, Anas georgica georgica, a small species of duck that is endemic too and only found on South Georgia, Southern Ocean.

White farmyard goose (anser species) swimming wild on the river thames, oxfordshire, uk

Adult Adelie penguin (Pygoscelis adeliae) inspecting a non-viable egg at Devil Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Group, Ecuador. This raptor species is endemic to the Galapagos Islands. Pacific Ocean.

The Leopard seal (Hydrurga leptonyx) is the second largest species of seal in the Antarctic

Adult Southern Rockhopper Penguins (Eudyptes chrysocome chrysocome) in the Falkland Islands. This is the smallest yellow-crested, black-and-white penguin in the genus Eudyptes. It reaches a length of 45-58 cm (18-23 in) and typically weighs 2-3.4 kg (4.4-7.5 lb), although there are records of exceptionally large rockhoppers weighing 5 kg (11 lbs). Their common name refers to the fact that unlike many other penguins which negotiate obstacles by sliding on their bellies or by awkward climbing using their flipper-like wings as aid, Rockhoppers will try to jump over boulders and across cracks. This behavior is by no means unique to this species however - at least the other "crested" penguins of the genus Eudyptes hop around rocks too. Southern Rockhopper Penguins have a global population of roughly 1 million pairs, perhaps a bit more. About two-thirds of the global population belongs to E. c. chrysocome which breeds on the Falkland Islands and on islands off Argentina and southern Chile. The Southern Rockhopper Penguin is classified as Vulnerable species by the IUCN.

Minke whale (Balaenoptera acutorostrata) surfacing at speed after lunging through bait ball of fish under seagulls. Husavik, Iceland

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Group, Ecuador. This raptor species is endemic to the Galapagos Islands. Pacific Ocean.

Adult Adelie penguins (Pygoscelis adeliae) tobogganing on an ice floe in the Weddell Sea, Antarctica. This penguin species is totally dependant on ice.

Adult Adelie penguin pair (Pygoscelis adeliae) hauled out on an iceberg at Devil Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

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Young Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, Ecuador. MORE INFO This raptor species is endemic to the Galapagos Islands.

Adult Adelie penguin (Pygoscelis adeliae) leaping from the sea onto ice floes near Heroina Island in the Weddell Sea, Antarctica. This penguin species is totally dependant on ice.

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Yellow-footed Gull (Larus livens) in flight at sunset in the Gulf of California (Sea of Cortez), Mexico. MORE INFO: This species is enedemic to only the Gulf of California.

King Penguin colony (Aptenodytes patagonicus) guarding against a Southern Giant Petrel (Macronectes gigantes) on South Georgia Island, southern Atlantic Ocean.

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Adelie penguins (Pygoscelis adeliae) hauled out on an iceberg in a snowstorm near Paulet Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

Adult Yellow-footed Gull (Larus livens) with creolefish in the Gulf of California (Sea of Cortez), Mexico. This species is enedemic to the Gulf of California.

Young Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, Ecuador. MORE INFO This raptor species is endemic to the Galapagos Islands.

Adult waved albatross (Diomedea irrorata) in flight on Espanola Island in the Galapagos Island Group, Ecuador. Pacific Ocean. This species of albatross is endemic to the Galapagos Islands. (RR)

Yellow-footed Gull (Larus livens) on nest on Isla San Esteban in the Gulf of California (Sea of Cortez), Mexico. This species is enedemic to the Gulf of California.

Adult waved albatross (Diomedea irrorata) in flight on Espanola Island in the Galapagos Island Group, Ecuador. Pacific Ocean. This species of albatross is endemic to the Galapagos Islands.

Yellow-footed Gull (Larus livens) in the Gulf of California (Sea of Cortez), Mexico. This species is enedemic to only the Gulf of California.

Yellow-footed Gull (Larus livens) in the Gulf of California (Sea of Cortez), Mexico. This species is enedemic to only the Gulf of California.

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Adult Adelie penguins (Pygoscelis adeliae) hauled out on an iceberg at Devil Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

Adult waved albatross (Diomedea irrorata) on Espanola Island in the Galapagos Island Group, Ecuador. Pacific Ocean. This species of albatross is endemic to the Galapagos Islands.

Adelie penguins (Pygoscelis adeliae) mock-mating (it is not mating season) on the beach on Paulet Island, Antarctic Peninsula. Adelie penguins are truly an ice dependant penguin species.

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Group, Ecuador. This raptor species is endemic to the Galapagos Islands. Pacific Ocean.