Black-headed heron (Ardea melanocephala) with its bill open, Addo Elephant National Park, South Africa, Africa

White-fronted tern (Sterna Striata) calling on a rock near South Head on the Tasman Sea, North Island, New Zealand

White-fronted tern (Sterna Striata) calling on a rock near South Head on the Tasman Sea, North Island, New Zealand

Southern giant petrel (macronectes giganteus) gold harbour, south georgia, close-up of head, portrait, beak open.

Bald eagle (Haliaeetus leucocephalus), immature, calling, found in North America, captive, Germany, Europe

Bird of prey shaped capital at the Achaemenid archeological site of Persepolis, UNESCO World Heritage Site, Persia, Iran, Asia

Young European Starlings (Sturnus vulgaris)

Snowy owl (Bubo scandiacus, Nyctea scandiaca), portrait, Hesse, Germany, Europe

African fish eagle (Haliaeetus vocifer) immature, portrait, found in Africa, captive, France, Europe

Dalmatian Pelican (Pelecanus crispus) with an open beak, on Lake Kerkini, Greece, Europe

Wolf (canus lupus) in clearing, captive, Bohemian Forest, Czech Republic, Europe

Great Egret (Egretta alba), juvenile birds on the nest, Florida, USA

Eurasian kingfisher (Alcedo atthis) flapping wings excitedly, female, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

Head of a puffin with open beak, Vardoe, Hornoeya, Varanger Peninsula, Finnmark, Norway, Europe

Barn swallow (Hirundo rustica) Young birds open their beaks, North Rhine-Westphalia, Germany, Europe

European bee-eaters (Merops apiaster) sitting on branch of an acacia, Baden-Wurttemberg, Germany, Europe

Blue-and-Yellow Macaw or Blue-and-Gold Macaw (Ara ararauna), adult, South America

Swimming Mute Swan (Cygnus olor), open beak, autumn mood, Hesse, Germany, Europe

Eagle Owl (Bubo bubo), with beak open, portrait

Bald Eagle (Haliaeetus leucocephalus), juvenile

Shadow of a cyclist and bike on a dirt path in a vast open landscape in Caprock Canyons State Park and Trailways, Texas, USA, Texas, United States of America

Australia, Full body of Koala (mouth open) in tree against blurry green.

The Brahminy Kite (Haliastur indus), also known as a red backed sea eagle, are scavengers rather than hunters. They feed on carrion, insects, reptiles, amphibians, crustaceans and fish, Philippines

Thailand, Nakhon Pathom, detail of many colorful handpainted umbrellas overlapping

A woman and a child standing at the open gate of a fenced enclosure. A girl holding a small plant in a pot.

Three young girls, friends side by side, posing for a photograph in the open air, New York state, USA

A child in the fresh open air on a sunny day, beside solar panels at a farm, New York state, USA