Juergen Freund / Saltwater crocodile (Crocodylus porosus) swimming underwater, New Guinea, Indo-pacific

Juergen Freund / Saltwater crocodile (Crocodylus porosus) swimming at water surface, split-level, New Guinea, Indo-pacific

Juergen Freund / Crinoids or featherstars covering a coral bommie with dive boat looming overhead, West New Britain, Papua New Guinea

Alex Mustard / A large Great hammerhead shark (Sphyrna mokarran), about 4m in length, cruises overhead. Bahamas, Tropical West Atlantic Ocean.

Birgitte Wilms / Golden Cownose Ray (Rhinoptera steindachneri) group underwater shot from below, group of ten, Galapagos Islands, Ecuador

Anup Shah / Celebes / Black crested macaque (Macaca nigra) group approaching with curiosity, overhead view, Tangkoko National Park, Sulawesi, Indonesia.

Anup Shah / Celebes / Black crested macaque (Macaca nigra) group sitting on the forest floor, Tangkoko National Park, Sulawesi, Indonesia.

Colin Varndell / Grass snake (Natrix natrix) about to slough its skin, Dorset, UK May

Roland Seitre / Indian Ocean Bottlenose Dolphin (Tursiops aduncus) breaching, seen from overhead. Mauritius.

Nick Upton / Low angle view of Canada geese (Branta canadensis), Whooper swans (Cygnus cygnus) and Coots (Fulica atra) on boating lake in winter sunshine, with flock of Feral pigeons (Columba livia) flying overhea...

Roger Powell / Northern gannet (Morus bassanus) hovering overhead, about to land at colony, Great Saltee island, Wexford, Republic of Ireland, June

Roger Powell / Northern gannet (Morus bassanus) flying overhead in cruciform position having just taken-off, Great Saltee island, Wexford, Republic of Ireland, June

Nick Upton / 2020VISION / Six juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project, with adult plumage developing at ten months, flying overhead, Somerset Levels and Moors, UK, March 2011.

Nick Upton / 2020VISION / Four juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project, identifiable by colour ring combinations as Clarence, Reg, Twinkle and Monty, with adult plumage developing at t...

Nick Upton / 2020VISION / Nine juvenile Common / Eurasian cranes (Grus grus) with adult plumage developing at ten months, flying in line overhead, Somerset Levels and Moors, UK, March 2011.

Nick Upton / 2020VISION / Three juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project, identifiable by colour ring combinations as Clarence, Reg and Twinkle, with adult plumage developing at ten mon...

Nick Upton / Three Greater flamingos (Phoenicopterus ruber) flying overhead against a blue sky, Camargue. France, May.

Nick Upton / Seven Greater flamingos (Phoenicopterus ruber) fly overhead in formation against a blue sky, Camargue. France, May.

Nick Upton / Five Greater flamingos (Phoenicopterus ruber) fly overhead in formation against a blue sky, Camargue. France, May.

Alex Mustard / Lemon shark (Negaprion brevirostris) swimming overhead, Little Bahama Bank, Bahamas. Tropical West Atlantic Ocean.

Mike Wilkes / Flock of Black crowned night heron {Nycticorax nycticorax} flying overhead, Lesbos, Greece

Nick Upton / Migrating flock of Common Cormorant (Phalacrocorax carbo) in flight overhead, Pyrenees, Spain, Autumn 2008

Nick Upton / Migrating flock of Common cormorants (Phalacrocorax carbo) in flight overhead, Pyrenees Mountains, Spain

Solvin Zankl / High angle shot of Northern gannets (Morus bassanus) flying overhead, Bass Rock, Scotland UK

Mike Wilkes / Lizard buzzard (Kaupifalco monogrammicus) perched on overhead electric cable, The Gambia, December