Great cormorant (Phalacrocorax carbo) juvenile, standing on a fallen branch, Rotter-meren, The Netherlands (Holland), Europe

Juvenile Andean condor (Vultur gryphus) soaring, Torres del Paine National Park, Chile, South America

Juvenile golden eagle (Aquila chrysaetos) perched on a snow covered high tree lit by the low winter sun, Taiga Forest, Finland, Scandinavia, Europe

Juvenile goshawk (Accipiter gentilis) in the snow paying attention to noises and potential threats with its prey beneath talons, Taiga Forest, Finland, Scandinavia, Europe

Juvenile golden eagle (Aquila chrysaetos), wings outstretched on the snow at the edge of a forest, Taiga Forest, Finland, Scandinavia, Europe

Juvenile golden eagle (Aquila chrysaetos) flying in the snow with claws out-stretched about to land on its prey, Taiga Forest, Lapland, Finland, Scandinavia, Europe

Juvenile goshawk (Accipiter gentilis) about to use its large talons to hold down a red squirrel in the snow, Taiga Forest, Finland, Scandinavia, Europe

Juvenile great tit (Parus major) garden bird, perched on a tree stump calling for food, Cheshire, England, United Kingdom, Europe

White-breasted cormorant (Phalacrocorax lucidus), juvenile, Kruger National Park, South Africa, Africa

Immature common ostrich (Struthio camelus), Kgalagadi Transfrontier Park, South Africa, Africa

A juvenile rufescent tiger heron (Tigrisoma lineatum), Pouso Alegre Fazenda, Brazil, South America

Martial Eagle (Polemaetus bellicosus), juvenile, Kruger National Park, South Africa, Africa

Immature wood sandpiper (Tringa glareola), Serengeti National Park, Tanzania, East Africa, Africa

Juvenile gannet (Morus bassanus) in flight above the sea at Bempton cliffs, Yorkshire, England, United Kingdom, Europe

Juvenile magnificent frigatebird (Fregata magnificens) attacking an Elliot's storm petrel (Oceanites gracilis galapagoensis), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Swallow-tailed bee-eater (Merops hirundineus) adult feeding young, Kgalagadi Transfrontier Park, South Africa, Africa

Juvenile white Ibis (Eudocimus albus) eating shrimp, United States of America, North America

Juvenile Refuscent tiger-heron (Tigrisoma lineatum), Pantanal, Mato Grosso, Brazil, South America

Coot (Fulica), young chick feeding, Gloucestershire, England, United Kingdom, Europe

Close-up of a juvenile black-crowned night heron (Nycticorax nycticorax falklandicus), Sea Lion Island, Falkland Islands, South Atlantic, South America

Immature Gabar goshawk (Micronisus gabar), Serengeti National Park, Tanzania, East Africa, Africa

Magnificent frigatebird (Fregata magnificens), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Magnificent frigatebirds (Fregata magnificens), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Swallow-tailed bee-eater (Merops hirundineus) adult and juvenile, Kgalagadi Transfrontier Park, South Africa, Africa

White-tailed ptarmigan (Lagopus leucurus) chick, San Juan National Forest, Colorado, United States of America, North America

Juvenile Cape Gull in Flight, Larus dominicanus, Indian Ocean, Wild Coast, South Africa

Coot (Fulica) young chicks, Gloucestershire, England, United Kingdom, Europe

Juvenile magnificent frigatebird (Fregata magnificens) attacking an Elliot's storm petrel (Oceanites gracilis galapagoensis), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Juvenile Galapagos penguin (Spheniscus mendiculus), Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Juvenile striated heron (Butorides striata), Puerto Ayora, Santa Cruz Island, Galapagos, UNESCO World Heritge Site, Ecuador, South America

Juvenile Great White Pelican, Pelecanus onocrotalus, Walvis Bay, Namibia

Juvenile brown pelican (Pelecanus occidentalis) plunge-diving, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Juvenile yellow-crowned night heron (Nyctanassa violacea), Genovesa Island, Galapagos Islands, Ecuador, South America

Juvenile yellow-headed caracara (Milvago chimachima), Pacaya-Samiria National Reserve, Loreto, Peru, South America

Juvenile yellow-crowned night heron (Nyctanassa violacea), Genovesa Island, Galapagos Islands, Ecuador, South America

Juvenile Great White Pelican, Pelecanus onocrotalus, Walvis Bay, Namibia

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Juvenile Wattled Jacana (Jacana jacana) walking on waterlilies leaves, Manu National Park, Peruvian Amazon, Peru, South America

Four month old Harpy eagle chick (Harpia harpyja), testing its wings in the nest, Alta Floresta, Amazon, Brazil, South America

Adult Nazca booby (Sula grantii) with downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

First year Adelie penguin (Pygoscelis adeliae) chick at breeding colony at Brown Bluff, Antarctica, Polar Regions

Juvenile grey heron (Ardea cinerea) in flight, escaping from an aggressive rival in a territorial dispute, Rutland Water, Rutland, England, United Kingdom, Europe

Juvenile double-crested cormorant (Phalacrocorax auritus) spreading its wings to dry, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Mallard duckling (Anas platyrhynchos). United Kingdom

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions

Red-tailed hawk (Buteo jamaicensis) juvenile in a snow-covered tree, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Green-backed heron (striated heron) (Butorides striatus), immature, Ngorongoro Crater, Tanzania, East Africa, Africa

Common ostrich (Struthio camelus) male with two chicks, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Hooded vulture (Necrosyrtes monachus) in mixed juvenile and adult plumage with a prize from a wildebeest kill, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Black-breasted snake eagle (black-chested snake eagle) (Circaetus pectoralis) in flight, immature, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

European (Eurasian) eagle owl (Bubo bubo) juvenile in flight, captive, Cumbria, England, United Kingdom, Europe

Snowy owl (Bubo scandiacus) juvenile, captive, Cumbria, England, United Kingdom, Europe

Juvenile (immature) European robin (Erithacus rubecula) perched in a Chiltern Hills garden, Henley-on-Thames, Oxfordshire, England, United Kingdom, Europe

Juvenile Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Juvenile Antarctic tern (Sterna vittata) in flight near Tristan da Cunha, South Atlantic Ocean

Juvenile Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Adult yellow-nosed albatross (Thalassarche chlorohynchos) in flight near the Tristan da Cunha Group, South Atlantic Ocean

Above and below water view of kelp in Hercules Bay, South Georgia, Polar Regions

Juvenile Yellow Crowned Night Heron (Nyctanassa violacea), Bermuda, North Atlantic, North America

Chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Adult Nazca booby (Sula grantii) with downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plain, South Georgia, Polar Regions

Juvenile great frigatebird (Fregata minor) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) newly hatched chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult blue-footed booby (Sula nebouxii) feeding chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

King penguin (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Injured juvenile yellow-footed gull (Larus livens), on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

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

Mute swans (Cygnus olor) on seashore at freshwater stream mouth, Arran, Scotland, United Kingdom, Europe

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

Blue-footed booby juvenile (Sula nebouxii), Punta Pitt, San Cristobal (Chatham) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

King penguin chick (Aptenodytes patagonicus), ecstatic display in Gold Harbor, South Georgia, Polar Regions

Black-breasted snake eagle (black-chested snake eagle) (Circaetus pectoralis), immature, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Juvenile red-tailed hawk (Buteo jamaicensis) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Common ostrich (Struthio camelus) chicks, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Juvenile Common blackbird (Turdus merula) waits for food from parent in a Chilterns garden, Henley-on-Thames, Oxfordshire, England, United Kingdom, Europe

Juvenile Wattled Jacanas (Jacana jacana) walking on waterlilies leaves with open wings, Manu National Park, Peruvian Amazon, Peru, South America

Juvenile reddish egret (Egretta rufescens), wading in tidal estuary, San Jose del Cabo, Baja California Sur, Mexico, North America

Juvenile Bald Eagle in flight (Haliaeetus leucocephalus), Jasper National Park, Alberta, Canada, North America

Juvenile Bald Eagle (Haliaeetus leucocephalus), Cape Breton National Park, Nova Scotia, Canada, North America

Juvenile golden eagle (Aquila chrysaetos) in flight over snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Snowy owl (Bubo scandiacus) juvenile in flight, captive, Cumbria, England, United Kingdom, Europe

A juvenile Galapagos hawk (Buteo galapagoensis), Rabida Island, Galapagos, Ecuador, South America

A juvenile Galapagos hawk (Buteo galapagoensis) in flight, Fernandina Island, Galapagos, Ecuador, South America

Juvenile western gulls (Larus occidentalis) feeding on tuna crabs, Isla Magdalena, Baja California Sur, Mexico, North America

Juvenile yellow-footed gull (Larus livens), eating a goatfish, Isla San Ildefonso, Baja California, Mexico, North America

Juvenile king penguins (Aptenodytes patagonicus) at breeding colony at Salisbury Plain, South Georgia, Polar Regions

Common ostrich (Struthio camelus) chick, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Common ostrich (Struthio camelus) female with two chicks, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Crimson rosella (juvenile), Yarra Ranges National Park, Victoria, Australia, Pacific

Red-tailed hawk (Buteo jamaicensis), juvenile, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Swallow-tailed bee-eater (Merops hirundineus), juvenile with a butterfly, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

A juvenile Galapagos hawk (Buteo galapagoensis), Rabida Island, Galapagos, Ecuador, South America

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions