Tim Edwards / Transmitter change on female kakapo. Little Barrier Is. NZ Rarest, heaviest bird in world>> Pictures taken Sept 91 high on one of the volcanic mountains of the island. Nocturnal habit unusual for parr...

Oliver Hellowell / Photographer Oliver Hellowell taking pictures of Mallard duck (Anas platyrhynchos) Loch Morlich, Scotland, UK. August.

Jack Dykinga / Greater flamingos (Phoenicopterus roseus) flock in flight past boat with tourists taking pictures, Ria Celestun Biosphere Reserve, Yucatan state, Mexico. January 2012.

Ingo Arndt / Wildlife Photographer Ingo Arndt taking pictures of a crowded King Penguin (Aptenodytes patagonicus) rookery, Salisbury Plain, South Georgia Island, February 2011

Markus Varesvuo / Male Capercaillie (Tetrao urogallus) in heavy snowfall, Kuusamo, Finland, April.

Markus Varesvuo / Great Grey Owl (Strix nebulosa) landing in snow, Kuusamo, Finland.

Markus Varesvuo / Night Heron (Nycticorax nycticorax) near a fish jumping out of the water, Hungary, May.

Markus Varesvuo / Red-crowned Cranes (Grus japonicus) flying at twilight, Hokkaido, Japan, February.

Markus Varesvuo / Ural Owl (Strix uralensis) in old barn, Kuusamo, Finland, February.

Markus Varesvuo / Steller's Sea Eagle (Haliaeetus pelagicus) in flight, searching for food, Hokkaido, Japan, February.

Markus Varesvuo / Spoonbill (Platalea leucorodia) swallowing fish, Hungary, May.

Markus Varesvuo / Snowy Owl (Bubo scandiaca) male preening feathers on a post, Canada, February.

Markus Varesvuo / Hooded Crow (Corvus corone cornix) attacking a White-tailed Sea Eagle (Haliaetus albicilla), Hungary, January.

Markus Varesvuo / Razorbill (Alca torda) in flight, Norway, April.

Markus Varesvuo / White-tailed Eagle (Haliaeetus albicilla) and Golden Eagle (Aquila chrysaetus) fighting, Norway, January.

Markus Varesvuo / White-tailed Eagle (Haliaeetus albicilla) and Golden Eagle (Aquila chrysaetus) fighting, Norway, January.

Markus Varesvuo / Guillemots (Uria aalge) taking off in snow, Norway, March.

Markus Varesvuo / Great Snipe (Gallinago media), Norway, June.

Markus Varesvuo / Grasshopper Warbler (Locustella naevia) singing, Finland, May. Small repro only.

Markus Varesvuo / Black Guillemot (Cepphus grylle) resting on rock, stretching wings, Shetland, UK, July.

Markus Varesvuo / Water Rail (Rallus aquaticus) taking off, Utö, Finland, August.

Markus Varesvuo / Merlin (Falco columbarius) portrait, Sheltand, UK, July.

Markus Varesvuo / Quail (Coturnix coturnix) male in grass, Spain, May.

Markus Varesvuo / Grey Partridge (Perdix perdix) in snow, Finland, January.

Markus Varesvuo / Quail (Coturnix coturnix) male in grass, Spain, May.

Markus Varesvuo / Capercaillie (Tetrao urogallus) female with chick tucked under her wing, Vaala, Finland, June. Small repro only.

Markus Varesvuo / Bearded Tit / Reedling (Panurus biarmicus) pair, female taking off a reed, Espoo, Finland, January.

Markus Varesvuo / Bearded Tits / Reedlings (Panurus biarmicus) feeding on reeds covered in snow, Helsinki, Finland, January.

Markus Varesvuo / Bearded Tit / Reedling (Panurus biarmicus) male feeding on reeds, Helsinki, Finland, January.

Markus Varesvuo / Dipper (Cinclus cinclus) beside river in snow, drying wings, Kuusamo, Finland, March.

Markus Varesvuo / Pygmy Owl (Glaucidium passerinum) landing in snow, Kuusamo, Finland, February.

Markus Varesvuo / Pygmy Owl (Glaucidium passerinum) taking off in snow, Kuusamo, Finland, February.

Markus Varesvuo / Pygmy Owl (Glaucidium passerinum) perched on pine branch, Kuusamo, Finland, February.

Markus Varesvuo / Pygmy Owl (Glaucidium passerinum) standing in deep snow, Kuusamo, Finland, February.

Markus Varesvuo / Golden Eagle (Aquila chrysaetos) juvenile landing in snow, interacting with a Magpie (Pica pica), Norway, November.

Markus Varesvuo / Golden Eagle (Aquila chrysaetos) juvenile with prey, possibly a Magpie, on top of a tree, Norway, November.

Markus Varesvuo / Golden Eagle (Aquila chrysaetos) juvenile in flight, Norway, November.

Markus Varesvuo / Hazel Grouse (Tetrastes bonasia) in snow covered trees, Suomussalmi, Finland, January.

Markus Varesvuo / King Eider (Somateria spectabilis) male taking off from water surface, Batsfjord, Norway, March.

Markus Varesvuo / Steller's Sea Eagles (Haliaeetus pelagicus) passing prey in mid-air, Hokkaido, Japan, February.

Markus Varesvuo / Steller's Sea Eagle (Haliaeetus pelagicus) with prey in beak in mid-air, Hokkaido, Japan, February.

Markus Varesvuo / Cormorant (Phalacrocorax carbo) in aggressive display, fighting over food with a Great White Egret (Ardea alba), Hungary, January.

Markus Varesvuo / Great White Egret (Ardea alba) and Grey Heron (Ardea cinerea) fighting over fish prey, Hungary, January. Sequence 1/2.

Markus Varesvuo / Great White Egret (Ardea alba) and Grey Heron (Ardea cinerea) dropping fish prey which they were fighting over, Hungary, January. Sequence 2/2.

Markus Varesvuo / Steller's Sea Eagle (Haliaeetus pelagicus) flying, Hokkaido, Japan, February.

Markus Varesvuo / Close up of Snowy Owl (Bubo scandiaca) female flying low, Canada, February.

Markus Varesvuo / Snowy Owl (Bubo scandiaca) female flying low, Canada, February.

Markus Varesvuo / Snowy Owl (Bubo scandiaca) male stretching leg, Canada, February.

Markus Varesvuo / Red-backed Shrike (Lanius collurio) flying, Hungary, May.

Markus Varesvuo / European Roller (Coracias garrulus) flying, note ringed legs, Hungary, May.

Markus Varesvuo / Red-backed Shrike (Lanius collurio) flying, Hungary, May.

Markus Varesvuo / Peregrine falcon (Falco peregrinus) flying, Vaala, Finland, June.

Markus Varesvuo / Shag (Phalacrocorax aristotelis) pair, necks entwined in bonding behaviour, Vardö, Norway.

Markus Varesvuo / Spoonbill (Platalea leucorodia) catching fish, Hungary, May.

Markus Varesvuo / Little Owl (Athene noctua) with frog prey in its beak, Hungary, May.

Markus Varesvuo / Blackbird (Turdus merula) feeding on Hawthorn berries, Helsinki, Finland, November.

Markus Varesvuo / Close up of Red-throated Diver (Gavia stellata) pair about to dive in water to search for food, Shetland, UK, July.

Markus Varesvuo / Gannets (Sula bassana) diving into water, hunting for fish, Shetland, UK, July.

Ingo Arndt / Wildlife Photographer Ingo Arndt on location, taking pictures of birds with telephoto lens out of his car. Lake Neusiedl, Austria , April. Model released.

Jean E. Roche / Photographer taking pictures of flamingos (Phoenicopterus roseus) Pont de Gau Ornithological Park, Camargue, France, March

Peter Cairns / Photographer in camouflage clothing taking pictures of Sandhill cranes (Grus canadensis) wintering in Bosque del Apache, New Mexico, USA, December 2012.

David Pattyn / Photographer David Pattyn taking photos pelicans on lake Kerkini, Greece, March

Roland Seitre / Children standing by the murals of the parrot conservation project, where Yellow-shouldered Amazons are raised. Isla Margarita, Nueva Esparta, Venezuela, 2007.

Bryan and Cherry Alexander / Tourist with an audience of Emperor penguins (Aptenodytes forsteri) as he takes pictures at the Snow Hill Island Colony. Antarctica, October.

David Tipling / Tim Appleton showing children bird illustrations in a field guide, Narra, Palawan, Philippines, March 2009

Roland Seitre / Photographers taking pictures of Snow geese (Anser caerulescens) during winter migration. Victoriaville, Quebec, Canada. November.

Roland Seitre / Photographers taking pictures of Greater flamingo (Phoenicopterus ruber) flock in water, France

Tim Laman / Photographer Tim Laman checking digital pictures on his laptop at his rain forest camp site in the mountains of Batanta Island, whilst Ornithologist Edwin Scholes and Samkris Tindige look on, Papua N...

Tui De Roy / Snorkeller taking pictures of Galapagos tortoise (Spheniscus mendiculus) Tagus Cove, Isabela Island, Galapagos. June 2015.

Tui De Roy / Tourist in boat taking pictures of Galapagos penguin (Spheniscus mendiculus) Elizabeth Bay, Isabela island, Galapagos. June 2011.

Markus Varesvuo / Little Egret (Egretta garzetta) walking, Hungary, May.