Bertie Gregory / 2020VISION / Mixed flock of Northern shovelers (Anas clypeata), Gadwalls (Anas strepera) and Common teal (Anas crecca) taking off from a small lagoon, Brownsea Island, Dorset, England, UK, February. Did you know?...

Staffan Widstrand / Eurasian / Grey wolf (Canis lupus) watching flying flock of Common raven (Corvus corax) Kuhmo, Finland. September.

Konrad Wothe / Mixed flock of Snow geese (Chen caerulescens atlanticus / Chen caerulescens) and Sandhill cranes (Grus canadensis) at wintering area at dawn, with full moon, Bosque del Apache, New Mexico, USA, Novemb...

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over landfill site, Pitsea, Essex, UK, November 2011

Nick Upton / 2020VISION / Flock of Wigeon (Anas penelope) and a few Common Teal (Anas crecca) flying overhead in winter, Greylake RSPB reserve, Somerset Levels, UK, December

Terry Whittaker / 2020VISION / Mixed flock of Dark-bellied brent geese (Branta bernicla) and other waterfowl on mudflats at dawn with town in background, Leigh-on-Sea, Essex, UK, October 2010

Nick Upton / Aerial view of a dense flock of Great Cormorants (Phalacrocorax carbo) resting on a sandbank at Scroby Sands along with a mixed species flock of gulls including Greater black-backed gulls (Larus marin...

Nick Upton / Large flock of Wigeon (Anas penelope) swimming and standing on flooded marshland on a foggy winter day with a small flock of Lapwings (Vanellus vanellus) in the background. Greylake RSPB reserve, Some...

Jenny E. Ross / Snow Geese (Chen caerulescens) and Ross's Geese (Chen rossii) taking off from field where they have been feeding, Imperial Valley, California, USA.

Kevin Schafer / Peruvian pelicans (Pelecanus thagus) on coastal rocks, Pucusana, Lima Province, Peru

Nick Upton / Mute swans (Cygnus olor) flying past flock of Common / Eurasian juvenile cranes (Grus grus) released by the Great Crane Project onto the Somerset Levels and Moors, foraging on frozen pastureland on a...

Russell Cooper / Avocets (Recurvirostra avosetta) and Black Tailed Godwits (Limosa limosa) on the lagoon at Brownsea Island, Poole Harbour, Dorset, England, UK, October 2009.

Ann & Steve Toon / Mixed flock of House sparrows (Passer domesticus) and Chaffinchs (Fringilla coelebs) on bird table after heavy snowfall, UK

David Kjaer / Flock of Blue tits (Parus caeruleus) and Great tit (Parus major) on Niger seed feeder, Gloucestershire, England

Stephen Dalton / Collection of bird feeders in garden, with Greenfinches (Carduelis chloris) and Great tits (Parus major) UK

Wild Wonders of Europe / Novák / Flock of Dunlin (Calidris alpina) and Knot (Calidris canutus) taking off, Grossmorsum, Sylt, Germany, April 2009

David Tipling / Mixed flock of Black-tailed Godwit {Limosa limosa} with Knot {Calidris canutus} and Redshank {Tringa totanus} at high tide roost, Snettisham RSPB Reserve, The Wash, Norfolk, UK, August

David Tipling / Mixed flock of Knot {Calidris canutus} and Oystercatcher {Haematopus ostralegus} at high tide roost, Snettisham RSPB Reserve, The Wash, Norfolk,UK, summer

Andy Rouse / Gentoo penguin (Pygoscelis papua) chick about to be killed by flock of Striated Caracara {Polyborus plancus} Falkland Islands

Anup Shah / Golden jackal {Canis aureus} predating flock of juvenile Lesser flamingo {Phoeniconaias minor} Lake Nakuru NP, Kenya

Anup Shah / Spotted hyaena {Crocuta crocuta} amongst flock of Lesser flamingo {Phoeniconaias minor} Lake Nakuru NP, Kenya

Anup Shah / Spotted hyaena {Crocuta crocuta} amongst flock of Lesser flamingo {Phoeniconaias minor} Lake Nakuru NP, Kenya

Hanne & Jens Eriksen / Lesser crested tern {Thalasseus bengalensis} flock on beach, large gulls and waves in background, Socotra, Yemen

Bernard Castelein / Indian gazelle (Chinkara) (Gazella bennetti) with flock of Common pigeons, Lohawat, Rajasthan, India

Jabruson / Red billed quelea flock {Quelea quelea} + African elephant calf {Loxodonta africana} drinking. Tsavo East NP, Kenya

Wild Wonders of Europe / Muñoz / Griffon vultures (Gyps fulvus) and European black vultures (Aegypius monachus) in mass flock feed on carcass, Campanarios de Azaba Biological Reserve, a rewilding Europe area, Salamanca, Castilla y Le...

Wild Wonders of Europe / Muñoz / Griffon vultures (Gyps fulvus) and European black vultures (Aegypius monachus) in mass flock feed, Campanarios de Azaba Biological Reserve, a rewilding Europe area, Salamanca, Castilla y Leon, Spain

Juan Carlos Munoz / Mixed flock of wading birds including Roseate Spoonbills (Platalea ajaja) silhouetted on water. Everglades National Park, Florida, USA, February.

Philippe Clement / Shepherd and tourists herding flock of sheep (Ovis aries) to pasture up in the mountains along the Col du Soulor, with free roaming horses, Hautes-Pyrenees, Pyrenees, France, June 2012

Anup Shah / African Buffalo herd (Syncerus caffer) surrounded by a flock of Cattle egrets (Bubulcus ibis) Masai Mara National Reserve, Kenya, September

Peter Cairns / 2020VISION / Large flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) taking flight. The Wash Estuary, Norfolk, England, UK, October. 2020VISION Book Plate.

Peter Cairns / 2020VISION / Large flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) taking flight. The Wash Estuary, Norfolk, October.

Peter Cairns / 2020VISION / Large flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) taking flight. The Wash Estuary, Norfolk, October.

Peter Cairns / 2020VISION / Large flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) taking flight. The Wash Estuary, Norfolk, October.

Peter Cairns / 2020VISION / Large flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) taking flight. The Wash Estuary, Norfolk, October.

Peter Cairns / 2020VISION / Flock of Oystercatchers (Haematopus ostralegus) and Knot (Calidris canuta) in flight and on tidal shallows. The Wash Estuary, Norfolk, September.

Chris Gomersall / 2020VISION / Flock of Red knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) in flight at high water on the Wash estuary, Snettisham RSPB reserve, Norfolk, England, UK, March

Chris Gomersall / 2020VISION / Flock of Red knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) in flight at high water on the Wash estuary, Snettisham RSPB reserve, Norfolk, England, UK, March

Bertie Gregory / 2020VISION / Mixed flock of Avocets (Recurvirostra avosetta) and Black-tailed godwits (Limosa lapponica) in flight with houses in the background, Brownsea Island, Dorset, England, UK, December

Bertie Gregory / 2020VISION / Mixed flock of Avocets (Recurvirostra avosetta) and Black-tailed godwits (Limosa lapponica) in flight, Brownsea Island, Dorset, England, UK, December

Bertie Gregory / 2020VISION / Flock of Dunlin (Calidris alpina) and gulls (Laridae) in flight, with houses in the background, Brownsea Island, Dorset, England, UK, February

Bertie Gregory / 2020VISION / Mixed flock of Northern shovelers (Anas clypeata), Gadwalls (Anas strepera) and Common teal (Anas crecca) standing on a frozen lagoon, Brownsea Island, Dorset, England, UK, February

Andrew Parkinson / 2020VISION / Mixed flock of Golden plover (Pluvialis apricaria) and Lapwing (Vanellus vanellus) roosting in shallow water of lagoon, evening, Titchwell RSPB Reserve, Norfolk, UK, October

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...

George Sanker / Grey wolf (Canis lupus) swimming through flock of Canada Geese (Branta canadensis) at dawn in thick fog on the Yellowstone River, Yellowstone NP, Wyoming, USA

Alan Williams / Black-headed gull (Chroicocephalus ridibundus) walking through flock of Knots (Calidris canutus) roosting on shore in early morning, Liverpool Bay, UK, December.

Roland Seitre / Flock of Cobalt-winged Parakeet (Brotogeris cyanoptera) and Black-capped Parakeet (Pyrrhura rupicola) in shade under tree. Madre de Dios, Peru, September.

Nick Upton / 2020VISION / Wigeon (Anas penelope) flock and a few Pintail (Anas acuta) resting on partially frozen flooded marshland in winter sunshine, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Nick Upton / 2020VISION / Wigeon (Anas penelope) flock and a few Pintail (Anas acuta) resting on partially frozen flooded marshland in winter sunshine, Catcott Lows National Nature Reserve, Somerset Levels, UK, January.

Chris Gomersall / 2020VISION / Flock of Northern gannets (Sula bassana) and a small pod of Killer whales (Orcinus orca) feeding in the wake of the pelagic trawler 'Charisma' in evening light, Shetland Islands, Scotland, UK, October...

Gerrit Vyn / Black necked stilts (Himantopus mexicanus) standing in a tight flock in response to an aerial predator at Audubon's Paul J. Rainey Sanctuary. Vermilion Parrish, Louisiana, USA. December

Laurie Campbell / Greylag geese (Anser anser) wintering flock taking flight from stubble field, Inverness-shire, Scotland, October

Chris Gomersall / 2020VISION / Large flock of Knot (Calidris canutus) and Bar-tailed godwit (Limosa lapponica) flying in a dense cloud whilst gathering on the foreshore at Snettisham RSPB reserve at high water, The Wash, Norfolk, E...

Chris Gomersall / 2020VISION / Large mixed flock of waders and wildfowl, including Knot (Calidris canutus), Bar-tailed godwit (Limosa lapponica), Common redshank (Tringa totanus), Dunlin (Calidris alpina), Oystercatcher (Haematopus...

Chris Gomersall / 2020VISION / Large mixed flock of waders and wildfowl, including Knot (Calidris canutus), Bar-tailed godwit (Limosa lapponica), Common redshank (Tringa totanus), Dunlin (Calidris alpina), Oystercatcher (Haematopus...

Chris Gomersall / 2020VISION / Large mixed flock of waders and wildfowl, including Knot (Calidris canutus), Bar-tailed godwit (Limosa lapponica), Common redshank (Tringa totanus), Dunlin (Calidris alpina), Oystercatcher (Haematopus...

Chris Gomersall / 2020VISION / Large mixed flock of waders and wildfowl, including Knot (Calidris canutus), Bar-tailed godwit (Limosa lapponica), Common redshank (Tringa totanus), Dunlin (Calidris alpina), Oystercatcher (Haematopus...

Chris Gomersall / 2020VISION / Monochrome image of a mixed flock of feeding Dunlin (Calidris alpina) and Common redshank (Tringa totanus) on an estuary with tidal creeks, The Wash, Norfolk, England, UK, March

Terry Whittaker / 2020VISION / Mixed flock of Lesser black-backed gulls (Larus fuscus) and Herring gulls (Larus argentatus), Wallasea Wild Coast Project, RSPB Greater Thames Futurescapes Project, Wallasea Island, Essex, England, UK...

Terry Whittaker / 2020VISION / Mixed flock of Lesser black-backed gulls (Larus fuscus) and Herring gulls (Larus argentatus), Wallasea Wild Coast Project, RSPB Greater Thames Futurescapes Project, Wallasea Island, Essex, England, UK...

Terry Whittaker / 2020VISION / Mixed flock of Corn buntings (Emberiza calandra) and Starlings (Sturnus vulgaris) in flight, Wallasea Wild Coast Project, RSPB Greater Thames Project, Wallasea Island, Essex, UK, November

Terry Whittaker / 2020VISION / Mixed flock of Corn buntings (Emberiza calandra) and Starlings (Sturnus vulgaris) in flight, Wallasea Wild Coast Project, RSPB Greater Thames Project, Wallasea Island, Essex, UK, November

Terry Whittaker / 2020VISION / Mixed flock of gulls flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, RSPB Bower's marsh in background, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Mixed flock of Gulls (Larus sp.) flying over a landfill site, with site worker walking across the foreground, Pitsea, Essex, England, UK, November 2011

Terry Whittaker / 2020VISION / Large flock of Gulls (Larus sp.) flying over a landfill site, Pitsea, Essex, England, UK, November 2011

Sergey Gorshkov / Bar tailed godwit (Limosa lapponica) in flight amongst a flock of mixed waders, Agapa River, Taimyr Peninsula, Siberia, Russia, June

Brent Stephenson / Salvin's Albatross (Thalassarche salvini) coming in to land on the sea with flock of Cape Petrels (Daption capense) feeding below. Characteristic underwing is visible. Off Kaikoura, Canterbury, New Ze...

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over and taking off from flooded marshes in winter, with electricity pylons in the background, Greylake RSPB reserve, Somerse...

Nick Upton / 2020VISION / Flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over flooded marshes and stands of Bulrushes (Typha latifolia), in winter, Greylake RSPB reserve, Somerset Levels, UK, December

Nick Upton / 2020VISION / Dense flock of European wigeon (Anas penelope), Common teal (Anas crecca) and a Lapwing (Vanellus vanellus) flying over and taking off from flooded marshes in winter, Greylake RSPB reserve, Somerset L...

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over flooded marshes in winter and landing on water fringed by Bulrushes (Typha latifolia), Greylake RSPB reserve, Somerset L...

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over flooded marshes in winter and landing on water fringed by Bulrushes (Typha latifolia), Greylake RSPB reserve, Somerset L...

Nick Upton / 2020VISION / Flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over and landing on flooded marshes, with many others swimming near stands of Bulrushes (Typha latifolia) in winter, Greylake RSPB...

Nick Upton / 2020VISION / Flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over and resting on flooded marshes in winter, Greylake RSPB reserve, Somerset Levels, UK, December

Nick Upton / 2020VISION / Flock of Wigeon (Anas penelope) and a few Common Teal (Anas crecca) flying overhead in winter, Greylake RSPB reserve, Somerset Levels, UK, December

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over flooded marshes in winter, Greylake RSPB reserve, Somerset Levels, UK, December

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over flooded marshes in winter and landing on water fringed by Bulrushes (Typha latifolia), Greylake RSPB reserve, Somerset L...

Nick Upton / 2020VISION / Dense flock of Wigeon (Anas penelope), Common Teal (Anas crecca) and a few Pintail (Anas acuta) flying over flooded marshes and stands of Bulrushes (Typha latifolia) in winter, Greylake RSPB reserve,...

Nick Upton / 2020VISION / Mixed flock of Wigeon (Anas penelope) and Common Teal (Anas crecca) flying over and descending to land with many others swimming on flooded marshes, near stands of Bulrushes (Typha latifolia), Greylak...

Terry Whittaker / 2020VISION / Flock feeding raft of Avocet (Recurvirostra avosetta) and other waders on grazing marsh, Oare marshes, RSPB Greater Thames Futurescapes Project, North Kent, UK, August 2011

Terry Whittaker / 2020VISION / Flock feeding raft of Avocet (Recurvirostra avosetta) and other waders on grazing marsh, Oare marshes, RSPB Greater Thames Futurescapes Project, North Kent, UK, August 2011

Kathryn Jeffs / Humpback whales (Megaptera novaeangliae) behind a hunting Southern Type B Killer whale (Orcinus orca) with flock of Skuas, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Andy Sands / Dunlin (Calidris alpina) flock in flight coming in to feed at low tide, with Oystercatchers on the shore. Isle of Tiree, Scotland, June.

Ernie Janes / Oystercatcher (Haematopus ostralegus) on shoreline with flock of Turnstones, North Norfolk, UK, Winter

Grzegorz Lesniewski / White Stork (Ciconia ciconia) walking through water as a flock of waterfowl takes flight. Biebrza Marshes, Biebrza National Park, Poland, August.

Shattil & Rozinski / Two Coyotes (Canis latrans) watching flock of Ring-billed gulls (Larus delawarensis) on frozen reservoir, Cherry creek state park, Denver, Colorado, USA, February