JIM CLARE / Buffon's / Great green macaw (Ara ambigua) adult pair at nest hole in Almendro tree, Costa Rica
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JIM CLARE / Buffon's / Great green macaw (Ara ambigua) adult pair in nest hole in Almendro tree, Costa Rica
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JIM CLARE / Buffon's / Great green macaw (Ara ambigua) chick in nest hole in Almendro tree, Costa Rica
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JIM CLARE / Buffon's / Great green macaw (Ara ambigua) chick in nest hole in Almendro tree, Costa Rica
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Vishal Jadhav / Malabar grey hornbill (Ocyceros griseus) landing on the nest hole and regurgitating Java plum fruits to feed to its chicks, Maharashtra, India, May.
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Vishal Jadhav / Great hornbill (Buceros bicornis) female flying in and landing on the nest hole with a Barbet chick kill then feeding it to her young, Maharashtra, India, May.
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Vishal Jadhav / Great hornbill (Buceros bicornis) male flying in and landing on nest hole with a Barbet chick kill to feed his young, Maharashtra, India, May.
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Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding its young with a Barbet chick, Maharashtra, India, May.
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Neil Challis / Common butterfly lizard (Leiolepis belliana) mother emerging from burrow with its babies, Southern Thailand, March.
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Vishal Jadhav / Lesser banded hornet (Vespa affinis) workers entering and exiting their nesting hole, Maharashtra, India, May.
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Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding the female fig fruits as she sits on the nest inside tree trunk, before jumping around the nest hole, Maharashtra, India, April.
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Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding the female fig fruits as she sits on the nest inside tree trunk, Maharashtra, India, April.
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Vishal Jadhav / Black-rumped flameback woodpecker / Lesser golden-backed woodpecker (Dinopium benghalense) mother feeding her chick in the nesting hole, Maharashtra, India, April.
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Simon Littlejohn / Female American mink (Neogale vison) entering a Kingfisher (Alcedo atthias) nest and taking a chick, Stour River, Dorset, UK, July.
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John Cancalosi / Gila Woodpecker (Melanerpes uropygialis) bringing food to nest in Saguaro cactus (Carnegiea gigantea) before leaving, Sonoran Desert, Arizona, USA.
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Pal Hermansen / Pygmy owl (Glaucidium passerinum) looking directly at camera as it peers out of nest hole in dead tree trunk, Viken, Norway.
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Kim Taylor / Female Red mason bee (Osmia bicornis) returning to her nest hole in a dead holly trunk, April.
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Rose Summers / Two Common kestrel (Falco tinnunculus) chicks sitting in entrance of nest hole in tree trunk, one chick begins flapping its wings to strengthen them, Devon, England, UK, June.
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Ingo Arndt / Close up of Honey bees (Apis mellifera) forming 'chains' and a 'ball' at the top of their tree hole nest as they establish a colony, Germany.
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Dave Watts / Hoopoe (Upupa epops) male and female pair visiting nest to feed chicks, France
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Dave Bevan / Slow motion clip of a Great spotted woodpecker (Dendrocopos major) returning to nest hole, attacked by a Nuthatch (Sitta europaea), Carmarthenshire, Wales, UK, April.
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Dave Bevan / European beewolf (Philanthus triangulum) returning to nest with European honey bee (Apis mellifera) prey, digging for entrance, Suffolk, England, UK, July.
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Nick Upton / Red mason bees (Osmia bicornis) entering and leaving nest hole drilled into a log within an insect hotel, Gloucestershire, England, UK, April.
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Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.
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Brian Bevan / Juvenile Green woodpecker (Picus viridis) leaving nest hole, shot looking up trunk, Bedfordshire, England, UK, June.
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Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.
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Brian Bevan / Slow motion clip of a male Kingfisher (Alcedo atthis) taking fish into nest hole before exiting backwards, Bedfordshire, England, UK, July.
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Karine Aigner / Fernandina's flicker (Colaptes fernandinae) peering out of nest hole, Cuba
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Karine Aigner / Cuban bare-legged owl (Margarobyas lawrencii) in nest hole. Cienaga de Zapata, Cuba.
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Sven Zacek / Black woodpecker (Dryocopus martius) excavating nest hole. Valgamaa, Southern Estonia. April.
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Dave Bevan / Pair of Sand martins (Riparia riparia) feeding chicks, Carmarthenshire, Wales, UK, July.
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Dave Bevan / Slow motion clip of a pair of Common swifts (Apus apus) approaching and entering a nest hole in limestone cliff, Norfolk, England, UK, May.
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Steven David Miller / Red-collared lorikeet (Trichoglossus rubritorquis) pair examining hole in Eucalyptus as a potential nesting hollow. Katherine, Northern Territory, Australia.
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Bence Mate / European roller (Coracias garrulus) peering out of nest with feather, Lake Csaj, Pusztaszer, Kiskunsagi National Park, Hungary, February.
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Dave Bevan / Male Great spotted woodpecker (Dendrocopos major) flying to a nest hole in an electricty pole and feeding chick, Carmarthenshire, Wales, UK, June.
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Dave Bevan / Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May.
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Dave Bevan / Slow motion clip of a Tawny owl (Strix aluco) leaving nest site in hollow tree, Carmarthenshire, Wales, UK, April.
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David Perpinan / Common rock sparrow (Petronia petronia) feeding chicks in nest, filmed using an infra-red camera, Cuenca, Castile-La Mancha, Spain, June.
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David Perpinan / Common rock sparrow (Petronia petronia) chick exploring outside nest, Cuenca, Castile-La Mancha, Spain, June.
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David Perpinan / Adult Common rock sparrow (Petronia petronia) feeding chicks, Cuenca, Castile-La Mancha, Spain, June.
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David Perpinan / Female Rock sparrow (Petronia petronia) feeding chick inside nest, filmed with an infrared camera, Spain, June.
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David Perpinan / Rock sparrow (Petronia petronia) feeding chick outside nest, Spain, June.
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Dave Bevan / Male Great spotted woodpecker (Dendrocopos major) entering nest hole and leaving with a faecal sac, Carmarthenshire, Wales, UK, June.
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Dong Lei / Black lipped pika (Ochotona curzoniae ) outside of nest hole, Serxu, Shiqu county, Sichuan Province, Qinghai-Tibet Plateau, China. August 2010.
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Gabriel Rojo / Scimitar-billed woodcreeper (Drymornis bridgesii) at nest hole, Calden forest, La Pampa, Argentina.
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Gabriel Rojo / Bay-winged cowbird,(Agelaioides badius) chicks begging for food, La Pampa, Argentina
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John Cancalosi / Pileated woodpecker (Dryocopus pileatus) feeding chicks at nest, Washington DC, USA, June.
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Yukihiro Fukuda / Japanese giant salamander (Andrias japonicus) emerging from hole and reaching up to the surface in order to breathe, Hino River, Tottori-ken, Japan, September.
