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

Adult black guillemot (Cepphus grylle) in summer plumage near Vigur Island in Isafjardardjup Bay, Iceland

Wandering albatross (Diomedea exulans) chick at nest site on Prion Island in the Bay of Isles, South Georgia, Polar Regions

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

Black-browed albatross (Thalassarche melanophrys) chick on the nest at nesting site on New Island, Falklands, South America

Helicopter on take-off area near the Maraya Theatre, in AlUla's Ashar Valley, Medina Province, Saudi Arabia

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

Adult Antarctic Shag, (Phalacrocorax (atriceps) bransfieldensis) from breeding colony on the Antarctic Peninsula

compass and map for orientation, Lower Saxony, Germany

Aerial photograph of the preflight preparation of a LTU Holidays airplane, Duesseldorf Airport, Rhein-Ruhr-Flughafen, Duesseldorf, Nordrhein-Westfalen, Germany, Europe

Duesseldorf-International Airport, Duesseldorf, North Rhine-Westphalia, Germany, Europe

Aerial photograph of the preflight preparation of a Thomas Cook Holidays airplane, Duesseldorf Airport, Rhein-Ruhr-Flughafen, Duesseldorf, Nordrhein-Westfalen, Germany, Europe

Aegean Airlines transport aircraft being manoeuvered on the runway, Dusseldorf International Airport, North Rhine-Westphalia, Germany, Europe

Delta aircraft before take-off, Hartsfield-Jackson Atlanta International Airport, Atlanta Airport, Atlanta, USA, North America

Bald eagle (Haliaeetus leucocephalus) in flight carrying nesting material; Quebec, Canada