Loic Poidevin / Yellow warbler (Dendroica petechia) at nest, Pointe Pelee, Ontario, Canada, May
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Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests, with one bird flying above. Patagonia, Argentina, March 2008
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Wild Wonders of Europe / della Ferrera / House martin (Delichon urbicum) and a Swallow (Hirundo rustica) collecting mud to build nests, Neretva river delta, Dalmatia region, Croatia, May 2009
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Laurie Campbell / Northern gannet (Morus bassanus) gathering nesting material, Bass Rock, Firth of Forth, East Lothian, UK, July
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Wild Wonders of Europe / Hermansen / Gannet (Morus bassanus) in flight carrying nest material, Saltee Islands, County Wexford, Republic of Ireland, June 2009
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Wild Wonders of Europe / Widstrand / Eastern white pelicans (Pelecanus onocrotalus), aerial view of flock nesting on ground within Danube delta rewilding area, Romania, June 2012
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Wild Wonders of Europe / Widstrand / Eastern white pelicans (Pelecanus onocrotalus), aerial view of flock nesting on ground within Danube delta rewilding area, Romania, June 2012
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Wild Wonders of Europe / Widstrand / RF- European bee eater (Merops apiaster) pair at nest hole, Danube delta rewilding area, Romania, June. (This image may be licensed either as rights managed or royalty free.)
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Yukihiro Fukuda / Sooty tern (Onychoprion fuscatus) flock in flight over Christmas Island, Indian Ocean, July
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Robin Chittenden / House Martins (Delichon urbicum) collecting mud with which to make nests, Northumberland UK June
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Robin Chittenden / House Martin (Delichon urbicum) picking up mud for nesting material, Northumberland UK June
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Roger Powell / Northern gannets (Morus bassanus) flying past their breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) hovering in flight, looking to land in colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) pair courting on rock, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) pair copulating on rock, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) brooding chick on nest, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) brooding chick on nest, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) displaying to surrounding birds, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) sitting on nest, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) flying above breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) flying above breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) flying over its breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannet (Morus bassanus) flying above breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) flying above their breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Roger Powell / Northern gannets (Morus bassanus) flying over their breeding colony, Great Saltee Island, Wexford, Republic of Ireland, June
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Charlie Summers / Red-billed hornbill (Tockus erythrorhynchus) feeding its mate who is sealed in its nest in the tree. This nest had a front door and a back door, one door is where the male is feeding the female and an...
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Andy Rouse / Northern gannet (Morus bassanus) landing in colony with seaweed for nest, Bempton Cliffs, UK, July
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Andy Rouse / Northern gannets (Morus bassanus) displaying at nest site, part of courtship, Bempton Cliffs, UK, July
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Andy Rouse / Northern gannets (Morus bassanus) displaying at nest site, part of courtship, Bempton Cliffs, UK, July
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Roger Powell / Northern gannet (Morus bassanus) adding nesting material to its nest, Great Saltee island, Wexford, Republic of Ireland, June
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Christophe Courteau / Sign warning of ground nesting birds, Ny-Alesund International Research village, Spitzbergen, Svalbard, Norway, July 2011 / Panneau d'avertissement pour indiquer la nidification d'oiseaux dans le v...
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Bernard Castelein / Northern gannet (Morus bassanus) stalling in flight carrying seaweed for nest in beak, Helgoland, Germany, May
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Bernard Castelein / Northern gannet (Morus bassanus) in flight carrying seaweed for nest in beak, Helgoland, Germany, May
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Nature Production / Greater Pied / Crested kingfisher (Megaceryle lugubris) digging nest hole in river bank, Shiga, Japan, march
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Inaki Relanzon / Bearded vulture (Gypaetus barbatus) with the leg of a rabbit in its mouth, which the bird uses as nesting material. Ordesa National Park, Aragon, Spain, November.
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Peter Cairns / 2020VISION / Gannet (Morus bassanus) tidying nest, Bass Rock, Firth of Forth, Scotland, UK, June
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Fergus Gill / Northern gannet (Morus bassanus) pair having a dispute with the bird on the neighbouring nest. Troup Head, Scotland, August.
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John Cancalosi / Northern gannet (Morus bassanus) with nesting materials. Canada, October 2005
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Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests. Patagonia, Argentina, March 2008
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Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests. Patagonia, Argentina, March 2008
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Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests. Patagonia, Argentina, March 2008
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Juan Carlos Munoz / Pair of Rockhopper penguins (Eudyptes chrysocome) with egg, with a group of penguins in the background. Penguin Island, Puerto Deseado, Patagonia, Argentina, Nov 2008
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Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests. Patagonia, Argentina, March 2008
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LYNN M. STONE / Blue eyed cormorant (Phalacrocorax atriceps) building nest, Antarctic peninsula
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Doug Allan / Lonnberg's skua (Stercorarius antarcticus lonnbergi) sitting on nest near Ushuaia, Beagle Channel, Tierra del Fuego, Argentina.
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Dietmar Nill / Northern gannet (Morus bassanus) bringing nest material to nest, Helgoland, Germany
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Wild Wonders of Europe / Widstrand / RF- White storks (Ciconia ciconia) nesting on poles erected by the city of Caceres in Extremadura, Spain, to compensate for the removal of an old farmhouse supporting a colony of storks. (This image m...
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Peter Cairns / naturepl.com / House Martin (Delichon urbicum) beside garden pool, collecting mud for nest, Cairngorms National Park, Scotland, UK, May
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Wild Wonders of Europe / della Ferrera / House martin (Delichon urbicum) and two Swallows (Hirundo rustica) collecting mud to build nests, with some fish eggs in the mud, Neretva river delta, Dalmatia region, Croatia, May 2009
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Wild Wonders of Europe / della Ferrera / Two House martins (Delichon urbicum) and a Swallow (Hirundo rustica) collecting mud to build nests, Neretva river delta, Dalmatia region, Croatia, May 2009
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Wild Wonders of Europe / Hermansen / Gannet (Morus bassanus) in flight with nest material, Saltee Islands, County Wexford, Republic of Ireland, June 2009
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Stephen Dalton / House martins {Delichon urbicum} gathering nesting material from lawn, UK
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David Tipling / Brown Jay {Psilorhinus morio} collecting nest material, Tikal, Guatemala
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Gary K. Smith / House martin (Delichon urbicum) adults collecting mud for nestbuilding, Norfolk, UK, May
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Alan Williams / Mediterranean gull (Ichthyaetus melanocephalus) in flight carrying nesting material, Minsmere RSPB Reserve, Suffolk, UK, April
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Alan Williams / Mediterranean gull (Ichthyaetus melanocephalus) 2nd summer adult in flight with nesting material, Minsmere RSPB Reserve, Suffolk, UK, May
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) in flight with nesting material (long bramble) Minsmere RSPB Reserve, Suffolk, UK, May
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) in flight with nesting material (long bramble) Minsmere RSPB Reserve, Suffolk, UK, May
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) in flight with nesting material, Minsmere RSPB Reserve, Suffolk, UK, May
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) in flight carrying nesting material, Minsmere RSPB Reserve, Suffolk, UK, June
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) hovering with nesting material, Minsmere RSPB Reserve, Suffolk, UK, June
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) gathering nesting material, Minsmere RSPB Reserve, Suffolk, UK, May
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) hovering with nesting material over nest, Minsmere RSPB Reserve, Suffolk, UK, June
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Alan Williams / Black-headed gull (Chroicocephalus ridibundus) landing at nest with nesting material, Minsmere RSPB Reserve, Suffolk, UK, June
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John Cancalosi / Great Egret (Ardea alba) perched with nesting material, Louisiana, USA
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Ian McCarthy / Blue eyed cormorant / Imperial shag {Phalacrocorax atriceps} in flight with nesting material, South Georgia
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Pete Oxford / Rockhopper penguin (Eudyptes chrysocome chrysocome) carrying pebble for nest building, Pebble Island, Falkland Islands
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Andy Sands / House martin (Delichon urbicum) collecting mud for nest building, Hertfordshire, England, UK.
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Wild Wonders of Europe / Varesvuo / Black-headed Gull (Chroicocephalus ridibundus) in flight, carrying nesting material, Pusztaszer, Hungary, May 2008
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Wild Wonders of Europe / Varesvuo / Black-headed Gull (Chroicocephalus ridibundus) in flight carrying nesting material, Pusztaszer, Hungary, May 2008
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Pete Oxford / Imperial Shag / King Cormorant / Imperial Cormorant (Phalacrocorax albiventer) carrying nesting material, Pebble Island, Falkland Islands
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Pete Oxford / Southern rockhopper penguin (Eudyptes chrysocome) carrying a pebble for nest building, Pebble Island, off north coast of West Falkland, Falkland Islands
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Pete Oxford / Imperial Shag / King Cormorant / Imperial Cormorant (Phalacrocorax albiventer) carrying nesting material, Pebble Island, Falkland Islands
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Juan Carlos Munoz / Northern gannet {Morus bassanus} flying, carrying seaweed for nest, Bass rock, Scotland, UK
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Kerstin Hinze / House Martin (Delichon urbicum) adult building nest from mud, Bulgaria
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Kerstin Hinze / House Martin (Delichon urbicum) adult building nest from mud, Bulgaria
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Kerstin Hinze / Northern gannet (Morus bassanus) adult flying carrying kelp for nesting material, Helgoland, North Sea, Germany
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Hanne & Jens Eriksen / Purple rumped sunbird {Nectarinia zeylonica} male at nest, Tamil Nadu, India
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Roger Powell / House Martin {Delichon urbicum} at nest complex on side of building, Alcantara, Spain
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Bernard Castelein / Northern gannet (Morus bassanus) flying with seaweed in beak, Helgoland, Germany
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Bernard Castelein / Northern gannet (Morus bassanus) with seaweed in beak, Helgoland, Germany
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David Kjaer / Cave Swallows (Petrochelidon fulva) collecting mud for nesting material, Texas, USA
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Roger Powell / Australian / Indonesian White Ibis (Threskiornis molucca) flying with nesting material. Victoria, Australia
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Tony Phelps / Leopard tortoise {Stigmochelys / Geochelone pardalis} filling in nest hole, Oudtshoorn, Little Karoo, South Africa
