Phil Savoie / Swift (Apus apus) in flight with blue cloudy sky, Monmouthshire, Wales, UK. April

Phil Savoie / Swift (Apus apus) in flight with blue cloudy sky, Monmouthshire, Wales, UK. July

Franco Banfi / Rough-legged hawk (Buteo lagopus) taking off in forest. Vrangel Bay, Primorsky Krai, Russia. August.

Franco Banfi / Rough-legged hawk (Buteo lagopus) perched on rock in boreal forest. Vrangel Bay, Primorsky Krai, Russia. August.

Franco Banfi / Rough-legged hawk (Buteo lagopus) in flight, viewed from below. Vrangel Bay, Primorsky Krai, Russia. August.

Franco Banfi / Rough-legged hawk (Buteo lagopus) perched on rock. Vrangel Bay, Primorsky Krai, Russia. August.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick on nest within rocks. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick on nest within rocks. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick on nest in rock crevice. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick, portrait. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick on nest in rock crevice. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) chick on nest in rock crevice. Nature Reserve, Savage Islands, Madeira.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) juvenile sitting in car park, lost at night due to light pollution. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) juvenile sitting in car park, lost at night due to light pollution. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) group floating on sea. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) on sea with wings stretched. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Scopoli's shearwater (Calonectris diomedea) on sea, reflected in water. Tenerife, Canary Islands.

Sergio Hanquet / Yellow-legged gull (Larus michahellis), juvenile in flight over sea. Tenerife, Canary Islands.

Sergio Hanquet / Yellow-legged gull (Larus michahellis) group in flight and resting on sea. Tenerife, Canary Islands.

Sergio Hanquet / Yellow-legged gull (Larus michahellis), two standing on rock. Tenerife, Canary Islands.

Sergio Hanquet / Common tern (Sterna hirundo) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Common tern (Sterna hirundo). Tenerife, Canary Islands.

Heather Angel / Red wattlebird (Anthochaera carunculata) feeding on nectar of flame grevillea (Grevillea excelsior) Kings Park, Western Australia Botanic garden, Western Australia.

Danny Green / Brunnich's guillemot (Uria lomvia) colony in mist, many birds in flight and nesting on cliffs. Svalbard, Norway, July 2018.

Ernie Janes / Greater flamingo (Phoenicopterus ruber) preening, head tucked under wing, portrait.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) in flight over sea between Isabela Island and Fernandina Island, Galapagos.

Nick Garbutt / Black-necked swan (Cygnus melancoryphus) pair in courtship on upland lake. Torres del Paine National Park, Patagonia, Chile. November 2018.

Nick Garbutt / Lesser rhea (Rhea pennata) male and chicks in grassland. Torres del Paine National Park, Patagonia, Chile. November.

Nick Garbutt / Spotted laughing thrush (Garrulax ocellatus) foraging on ground. Singalila National Park, India.

Nick Garbutt / King penguin (Aptenodytes patagonicus) breeding colony with adults and juveniles. Salisbury Plain, South Georgia. November.

Nick Garbutt / King penguin (Aptenodytes patagonicus), Antarctic fur seal (Arctocephalus gazella) and Southern elephant seal (Mirounga leonina), many on beach. Salisbury Plain, South Georgia. November 2018.

Nick Garbutt / Spotted laughing thrush (Garrulax ocellatus) perched on Bamboo, Singalila National Park, India.

Nick Garbutt / Black-faced laughing thrush (Garrulax affinis) perched on branch. Singalila National Park, India. March.

Nick Garbutt / Black-browed albatross (Thalassarche melanophris) flying over South Atlantic. Cooper Bay, South Georgia. November.

Ashley Cooper / Long-tailed tit (Aegithalos caudatus) gathering feathers for nest. May.

Nick Garbutt / Black-browed albatross (Thalassarche melanophris) in flight over sea at sunrise. South Atlantic Ocean between The Falklands and South Georgia. November.

Nick Garbutt / Andean condor (Vultur gryphus) male flying over forest. Estancia Olga Teresa, Patagonia, Chile. December 2018.

Nick Garbutt / Andean condor (Vultur gryphus) male in flight. Estancia Olga Teresa, Patagonia, Chile. December 2018.

Nick Garbutt / King penguins (Aptenodytes patagonicus) breeding colony with adults and juveniles, snowy mountains in background. Salisbury Plain, South Georgia. November 2018.

Nick Garbutt / King penguin (Aptenodytes patagonicus), close up of neck feathers. Salisbury Plain, South Georgia. November.

Nick Garbutt / King penguin (Aptenodytes patagonicus), close up of neck feathers. Salisbury Plain, South Georgia. November.

Nick Garbutt / Black-faced laughing thrush (Garrulax affinis), Singalila National Park, India.

Nick Garbutt / King penguin (Aptenodytes patagonicus) group of seven walking one behind the other along sand bar. St Andrews Bay, South Georgia. November.

Nick Garbutt / King penguin (Aptenodytes patagonicus) group of six walking along beach, tourists watching from inflatable boat in background. St Andrews Bay, South Georgia. November 2018.

Nick Garbutt / King penguin (Aptenodytes patagonicus) group walking along beach, tourists landing from inflatable boat in background. St Andrews Bay, South Georgia. November 2018.

Nick Garbutt / Black-browed albatross (Thalassarche melanophris) in flight over South Atlantic, viewed through ship's window. South Georgia.

Nick Garbutt / Black-browed albatross (Thalassarche melanophris) in flight over South Atlantic, viewed through ship's window. South Georgia.

Nick Garbutt / King penguin (Aptenodytes patagonicus) group following each other in line, returning to sea, Southern elephant seal (Mirounga leonina) colony in background. St Andrews Bay, South Georgia. November 201...

Nick Garbutt / Black-browed albatross (Thalassarche melanophris), three in flight. South Atlantic Ocean between The Falklands and South Georgia. November.

Nick Garbutt / Black-faced laughing thrush (Garrulax affinis) perched on branch. Singalila National Park, India.

Nick Garbutt / Coscoroba swan (Cisne coscoroba) female and chicks, swimming in a row. Torres del Paine National Park, Patagonia, Chile. November.

Nick Garbutt / RF - King penguin (Aptenodytes patagonicus) colony with adults and juveniles. Salisbury Plain, South Georgia Island. November. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - King penguin (Aptenodytes patagonicus) colony with adults and chicks. Salisbury Plain, South Georgia Island. November. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - Black-browed albatross (Thalassarche melanophris) in flight, snow covered coastline in background. Cooper Bay, South Georgia. November 2018. (This image may be licensed either as rights managed o...

Nick Garbutt / RF - King penguins (Aptenodytes patagonicus), two standing on snow, one sleeping or preening. Grytviken, South Georgia. March. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - Chestnut-crowned laughing thrush (Trochalopteron erythrocephalum) foraging, Singalila National Park, India. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - King penguin (Aptenodytes patagonicus), four returning to sea. St Andrews Bay, South Georgia. November. (This image may be licensed either as rights managed or royalty free.)

Nick Garbutt / RF - Black-browed albatross (Thalassarche melanophris), two flying in opposite directions, another in background. South Atlantic Ocean between The Falklands Islands and South Georgia. November. (This...

Nick Garbutt / Southern elephant seal (Mirounga leonina), two males, equally matched with mouths open in aggression. Out of focus King penguin (Aptenodytes patagonicus) colony in background. Gold Harbour, South Geor...

Nick Garbutt / King penguin (Aptenodytes patagonicus) displaying, looking skywards, surrounded by immature chicks. Salisbury Plain, South Georgia. November.

Ashley Cooper / Gentoo penguin (Pygoscelis papua) feeding chicks. February 2019.

Ashley Cooper / Chinese tourist from Antarctic expedition cruise ship taking selfie with Gentoo penguin (Pygoscelis papua) that has walked up to her. Antarctic Peninsula, Antarctica. February 2019.

Mike Potts / Southern royal albatross (Diomedea epomophora) flying over breeding grounds in grassland. Campbell Island, New Zealand. February.

Mike Potts / Southern royal albatross (Diomedea epomophora) sub-adults, group displaying in tussock grassland. Campbell Island, New Zealand. February.

Mike Potts / Southern royal albatross (Diomedea epomophora) sub-adults, group displaying in tussock grassland. Campbell Island, New Zealand. February.

Mike Potts / Southern royal albatross (Diomedea epomophora) sub-adults, group displaying in tussock grassland. Campbell Island, New Zealand. February.

Mike Potts / New Zealand scaup (Aythya novaeseelandiae) on Lake Wanaka, South Island, New Zealand.

Ann & Steve Toon / Ostrich (Struthio camelus) silhouetted in dust storm. Kalahari Gemsbok National Park, Kgalagadi Transfrontier National Park, Northern Cape, South Africa.

Dong Lei / Rufous-necked snowfinch (Pyrgilauda ruficollis) with insects in beak, feeding chicks at nest in rock hollow. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau, China. Augus...

Dong Lei / Snow partridge (Lerwa lerwa) standing on rock. Jiudingshan Nature Reserve, Mao Country, Sichuan Province, China. November.

Dong Lei / Upland buzzard (Buteo hemilasius) perched on wall. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau, China. August.

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Colin Varndell / Song thrush (Turdus philomelos) anvil with broken snail shells. Dorset, England, UK. April.

Jack Dykinga / Burrowing owl (Athene cunicularia) curious juvenile cocking head at 90 degrees. Sheltering in shade of Corn / Maize crop. Marana, Arizona, USA.

Dong Lei / Forest wagtail (Dendronanthus indicus) amongst leaf litter. Simao, Pu'er Prefecture, Yunnan Province, China

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blood pheasant (Ithaginis cruentus). Mount Luoji Nature Reserve, Sichuan Province, China. May.

Dong Lei / Asian openbill stork (Anastomus oscitans) roosting in tree. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Asian openbill stork (Anastomus oscitans) flock in flight, silhouetted in morning light. Individuals carrying food or nesting material in beaks. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Asian openbill stork (Anastomus oscitans) flock in flight, individuals carrying food or nesting material in beaks. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Forest wagtail (Dendronanthus indicus) on sand. Simao, Pu'er Prefecture, Yunnan Province, China

Dong Lei / Grey nightjar (Caprimulgus indicus). Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blue-throated barbet (Megalaima asiatica) at night roost in tree hole. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blue-throated barbet (Megalaima asiatica) roosting in tree stump at night. Simao, Pu'er Prefecture, Yunnan Province, China.

Dong Lei / Blood pheasant (Ithaginis cruentus). Mount Luoji Nature Reserve, Sichuan Province, China. May.

Dong Lei / Spotted dove (Spilopelia chinensis) roosting in tree, half moon in sky. Mount Luoji Nature Reserve, Sichuan Province, China. May.

Dong Lei / Little owl (Athene noctua) perched on Mani stones. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. October.

Dong Lei / White eared-pheasant (Crossoptilon crossoptilon). Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. October.

Dong Lei / Asian house martin (Delichon dasypus), two on rock ledge. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Lammergeier (Gypaetus barbatus) in flight. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Ground tit (Pseudopodoces humilis) in hole in cracked clay. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Redshank (Tringa totanus) standing in snow. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.