Flock of snow geese --- Image by © Winfried Wisniewski/Corbis
28 Nov 2005, Bosque del Apache National Wildlife Refuge, New Mexico, USA --- Flock of Snow Geese in Flight --- Image by © Arthur Morris/Corbis
02 Feb 2010, Derbyshire, England, UK --- Flock of Black-headed gull flying in blizzard --- Image by © Andrew Parkinson/Corbis
A flock of geese flying in formation --- Image by © 68/Ocean/Corbis
Barnacle Goose (Branta leucopsis) flock flying, Netherlands
Tundra Swan (Cygnus columbianus) flock flying, Mattamuskeet National Wildlife Reserve, North Carolina
Rome, Italy --- A flock of birds over Rome --- Image by © 145/Julio Lopez Saguar/Ocean/Corbis
Flock of seagulls in flight --- Image by © Kevin Schafer/Corbis
Doves flying in a blue sky --- Image by © IDC/amanaimages/Corbis
01 Oct 2000 --- Geese Flying at Sunset --- Image by © Ron Sanford/CORBIS
Flock of white-fronted geese formation flying at sunset --- Image by © Paul van Gaalen/Corbis
01 Jan 2009, Dumfries and Galloway, Scotland, UK --- Flock of barnacle geese flying through heavy fog --- Image by © Andrew Parkinson/Corbis
Canada Goose flying (Branta canadensis), USA.
Snow Goose (Chen caerulescens) flock flying during migration, Bosque del Apache National Wildlife Refuge, New Mexico
Flock of geese in flight --- Image by © Winfried Wisniewski/Corbis
Genovesa Island, Ecuador --- Genovesa Island, Galapagos National Park, Galapagos Islands, Ecuador --- Image by © 167/Ralph Lee Hopkins/Ocean/Corbis
Snow geese --- Image by © Frank Lukasseck/Corbis
Milk River, Alberta, Canada --- Green-winged teal duck migration, Milk River region of Alberta. --- Image by © 167/Pete Ryan/Ocean/Corbis
ca. March, 1991, Blackwater National Wildlife Refuge, Maryland, USA, USA --- A flock of Canada geese silhouetted a firey sky, with the Sun mostly obscured by a cloud. Blackwater National Wildlife Refuge, Maryland. --- Image by © Raymond Gehman/CORBIS
01 Nov 2003, Iran --- Greater Flamingos in Lake --- Image by © George Steinmetz/Corbis