Donald M. Jones / Western Bluebird (Sialia mexicana) male in nest cavity entrance, Montana
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Donald M. Jones / Hairy Woodpecker (Picoides villosus) male with prey at nest cavity entrance, western Montana
00160407
Michael Quinton / Red Squirrel (Tamiasciurus hudsonicus) four young at entrance to their nest in a tree cavity, Alaska
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John Chan / Female Downy woodpecker nestling (Picoides pubescens) peering out and calling from the entrance of its nest cavity, begging to be fed, Southern California, USA, May.
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John Chan / Male Downy woodpecker nestling (Picoides pubescens) peering out and calling from the entrance of its nest cavity, begging to be fed, Southern California, USA, May.
01622772
Marie Read / Equipment set up for remote control photography at nest hole of Great Crested Flycatcher (Myiarchus crinitus), New York, USA. Camera, fitted with wide angle lens, mounted on monopod attached to ladder...
01622771
Marie Read / Great crested flycatcher (Myiarchus crinitus), female alighting at nest cavity entrance carrying pine needles as nest material, wide angle captured with remote camera to show habitat, New York, USA. M...
01528123
Nick Upton / German / European wasp (Vespula germanica) worker carrying some small sticks while excavating a nest cavity to deposit them outside as two other workers defend the nest entrance, chalk grassland meado...
00546053
Donald M. Jones / Western Bluebird (Sialia mexicana) male at nest cavity entrance, Montana
01411253
Marie Read / Red-breasted Sapsucker (Sphyrapicus ruber), outside entrance to nest cavity in treetrunk, holding beakful of insects for young. Lee Vining Canyon, Mono Lake Basin, California, USA, June.
00479699
Martin Willis / Black-throated Finch (Poephila cincta) at entrance to nest cavity, Flat Creek Station, Georgetown, Queensland, Australia
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Murray Cooper / Powerful Woodpecker (Campephilus pollens) female at entrance to nest cavity, Ecuador
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Murray Cooper / Long-tailed Woodcreeper (Deconychura longicauda) at entrance to nest cavity, Ecuador
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Shin Yoshino / Indian Scops Owl (Otus bakkamoena) at entrance to nest cavity, Japan
01261105
Laurie Campbell / Barn Owl (Tyto alba) adult at entrance to nest cavity in dead Elm tree at dawn, Berwickshire, Scotland, UK, July
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Laurie Campbell / Barn Owl (Tyto alba) adult at entrance to nest cavity in dead Elm tree, Berwickshire, Scotland, UK, July
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Laurie Campbell / Barn Owl (Tyto alba) adult at entrance to nest cavity in dead Elm tree, Berwickshire, Scotland, UK, July
01261100
Laurie Campbell / Barn Owl (Tyto alba) adult at entrance to nest cavity in dead Elm tree, Berwickshire, Scotland, UK, July
00439886
Tui De Roy / Magellanic Woodpecker (Campephilus magellanicus) male at nest entrance, in Southern Beech (Nothofagus sp), Tierra del Fuego National Park, Argentina
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Donald M. Jones / Western Bluebird (Sialia mexicana) female at nest cavity entrance with insect prey, western Montana
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Donald M. Jones / Western Bluebird (Sialia mexicana) female at nest cavity entrance with insect in beak, western Montana
00210288
Pete Oxford / Rose-ringed Parakeet (Psittacula krameri) at nest entrance, Ranthambhore National Park, Rajasthan, India
01165367
Roger Powell / Barn Owl (Tyto alba) juveniles nestling in together at entrance to nest cavity, Northumberland, UK
01017104
Doug Wechsler / Cuban amazon parrot (Amazona leucocephala) at nest cavity entrance, Zapata Swamp, Cuba
00279176
Flip de Nooyer / Robust Woodpecker (Campephilus robustus) at entrance to nest cavity, Pantanal, Brazil
00180300
Thomas Mangelsen / Mountain Bluebird (Sialia currucoides) at entrance of nest cavity, Yellowstone National Park, Wyoming
00300383
Claus Meyer / Campo Flicker (Colaptes campestris) at entrance of nest cavity, Pantanal ecosystem, Brazil
00160408
Michael Quinton / Red Squirrel (Tamiasciurus hudsonicus) four young at entrance to their nest in a tree cavity, Alaska
00160953
Michael Quinton / Bufflehead (Bucephala albeola) chick at nest entrance in tree, boreal pond habitat, Alaska
00160952
Michael Quinton / Bufflehead (Bucephala albeola) mother flying to nest entrance, boreal pond habitat, Alaska
00160951
Michael Quinton / Bufflehead (Bucephala albeola) chicks in nest in tree trunk with mother at nest entrance, boreal pond habitat, Alaska
00140691
Tui De Roy / King Vulture (Sarcoramphus papa) at the entrance of its nest cavity in snag, Tambopata River, Peruvian Amazon, Peru
01743563
Lucas Bustamante / Tawny-bellied screech owl (Megascops watsonii) perched at entrance to nest hole in tree cavity, Yasuni National Park, Orellana, Ecuador.
01726955
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male perched above a potential nest cavity in Dipterocarp tree as female investigates the inside whilst perched at the entrance, Kalimantan Province, Borneo, Indone...
01726953
Tim Laman / Helmeted hornbill (Rhinoplax vigil) female perched at entrance to nest cavity in Dipterocarp tree, Kalimantan, Borneo, Indonesia. Critically endangered.
01726939
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it whilst perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically enda...
01726937
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it whilst perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically enda...
01726935
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it whilst perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically enda...
01726934
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it whilst perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically enda...
01726922
Tim Laman / Helmeted hornbill (Rhinoplax vigil) female examining nest cavity in a large Dipterocarp tree,as male perches above entrance, Kalimantan, Borneo, Indonesia. Critically endangered.
01726938
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it while perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically endan...
01726936
Tim Laman / Helmeted hornbill (Rhinoplax vigil) male delivering fruit to female in nest cavity by regurgitating it whilst perched at entrance, Budo-Sungai Padi National Park, Narathiwat, Thailand. Critically enda...
01661375
Ingo Arndt / Thermal image of a Honey bee (Apis mellifera) colony in an abandoned Black woodpecker nest in a tree cavity, viewed from the nest entrance at night. Cooler parts appear darker, warmer parts appear bri...
01661373
Ingo Arndt / Honey bee (Apis mellifera) worker bees cleaning the wall around the entrance of the nest cavity, view of the cavity / Germany
01661367
Ingo Arndt / Honey bees (Apis mellifera) starting a colony in an abandoned Black woodpecker nest cavity, Germany. May.
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Ingo Arndt / Honey bees (Apis mellifera) starting a beehive in a tree nest cavity, Germany.
01661220
Ingo Arndt / Honey bee (Apis mellifera) nest within an old black woodpecker nest cavity with honeycombs visible through front entrance, Germany.
01661192
Ingo Arndt / Honey bee (Apis mellifera) colony building a beehive inside an old black woodpecker nest cavity, forming a 'ball' at the top, Germany.
01661190
Ingo Arndt / Honey bee (Apis mellifera) workers cleaning the wall around the entrance of their tree hole beehive as seen from within the cavity, Germany.
01661173
Ingo Arndt / Honey bee (Apis mellifera) colony beginning to establish a hive inside an old black woodpecker nest cavity as viewed from outside, Germany
01661171
Ingo Arndt / Honey bee (Apis mellifera) colony closing nest entrance to their hive inside an old black woodpecker nest cavity as viewed from outside, Germany.
01661166
Ingo Arndt / Honey bee (Apis mellifera) worker bees isolate wall inside their nest cavity, close to the entrance, with propolis or bee glue, Germany.
01661371
Ingo Arndt / Honey bee (Apis mellifera) swarm starting a colony inside an abandoned Black woodpecker nest cavity, showing nest entrance from outside, Germany. May.
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Ingo Arndt / Viewed from inside a tree hole nest cavity, a Honey bee (Apis mellifera) swarm arriving at the entrance to establish a hive, viewed from inside, Germany.
01643617
Tim Laman / Golden-shouldered parrot (Psephotellus chrysopterygius) male at entrance to nest cavity in a termite mound. Cape York Peninsula, Queensland, Australia. May.