Neil Challis / Male Baya weaver (Ploceus philippinus) working on hanging nest, Central Thailand, August.
Neil Challis / Common butterfly lizard (Leiolepis belliana) mother emerging from burrow with its babies, Southern Thailand, March.
Vishal Jadhav / Lesser banded hornet (Vespa affinis) workers entering and exiting their nesting hole, Maharashtra, India, May.
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.
Vishal Jadhav / Great hornbill (Buceros bicornis) male feeding the female fig fruits as she sits on the nest inside tree trunk, Maharashtra, India, April.
Vishal Jadhav / Black-rumped flameback woodpecker / Lesser golden-backed woodpecker (Dinopium benghalense) mother feeding her chick in the nesting hole, Maharashtra, India, April.
Simon Littlejohn / Eurasian griffon vulture (Gyps fulvus) regurgitating food, before the chick falls onto its back, parent tries to help, Casares, Andalusia, Spain, March.
Simon Littlejohn / Eurasian griffon vulture (Gyps fulvus) in nest with a one-week-old chick nestled under its breast plumage moving round, Casares, Andalusia, Spain, March.
Neil Challis / Weaver ant (Oecophylla sp.) workers using their mandibles to pull two leaves together as part of their nest building process, Western Thailand.
Nick Upton / Jackdaw (Corvus monedula) hovering above a nest box it wants to nest in which a Grey squirrel (Sciurus carolinensis) and its mate have occupied, with the squirrel threatening the bird, Wiltshire, UK,...
Vishal Jadhav / Spotted owlet (Athene brama) female looking out of nest in rocks, males appears then flies off, Maharashtra, India, January.
Magnus Lundgren / Juvenile Ocellaris / Common clownfish (Amphiprion ocellaris) looking out from its home in an anemone, Raja Ampat, West Papua, Indonesia, Pacific Ocean.
Simon Littlejohn / Female American mink (Neogale vison) entering a Kingfisher (Alcedo atthias) nest and taking a chick, Stour River, Dorset, UK, July.
Simon Littlejohn / Common kingfisher (Alcedo atthis) perched outside its nest, opening its wings and beak in an aggressive display to a Common blackbird (Turdus merula) which eventually flies away, River Stour, Dorset,...
Kim Taylor / Female Red mason bee (Osmia bicornis) stocking her nest in a glass tube with nectar and pollen before laying an egg, followed by her sealing the cell with mud, Surrey, UK, April.
Richard Hopkins / Field vole (Microtus agrestis) cleaning itself in nest before leaving, Gloucestershire, UK, April.
Nick Upton / White stork (Ciconia ciconia) with three chicks in nest at top of an Oak tree, gaping in hot sunshine with one exercising its wings, Knepp Estate, Sussex, UK, June.
Marie Read / Black Skimmer (Rynchops niger) excavating nest scrape on beach by squatting and kicking backwards using its feet, Long Island, New York, USA, August.
Marie Read / Black Skimmer (Rynchops niger) brooding small chick in nest on beach, Long Island, New York, USA, August.
Marie Read / Black Skimmers (Rynchops niger) nesting, one adult feeds a fish to a small chick that emerges from underneath second adult, Long Island, New York USA, August.
John Cancalosi / Gila Woodpecker (Melanerpes uropygialis) bringing food to nest in Saguaro cactus (Carnegiea gigantea) before leaving, Sonoran Desert, Arizona, USA.
John Chan / Double-crested Cormorant (Phalacrocorax auritus) chicks sitting in nest, pestering parent for food before the parent feeds one of the chicks, California, USA, May.
Pal Hermansen / Pygmy owl (Glaucidium passerinum) looking directly at camera as it peers out of nest hole in dead tree trunk, Viken, Norway.
John Chan / Great blue herons (Ardea herodias) engaging in twig transfer during nest building, Bolsa Chica Ecological Reserve, Southern California, USA, February.
Kim Taylor / Female Red mason bee (Osmia bicornis) returning to her nest hole in a dead holly trunk, April.
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.
Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) feeding crop milk to chick, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, June
Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) chick stretching wings, watched by adult, at nest in breeding colony, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, June
Claudio Contreras / Caribbean flamingo (Phoenicopterus ruber) standing on nest in breeding colony, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, July
Brian Bevan / Wren (Troglodytes troglodytes) feeding chicks and removing fecal sac from nest in garden, Bedfordshire, UK, August
Brian Bevan / Wood pigeon (Columba palumbus) resting with chick in nest before catching a fly and eating it, Bedfordshire, UK, August.
Staffan Widstrand / Wild Wonders of China / Oriental / Crested honey buzzard (Pernis ptilorhynchus) feeding on honeycomb surrounded by bees, Chayi, Taiwan Controlled conditions
Staffan Widstrand / Wild Wonders of China / Oriental / Crested honey buzzard (Pernis ptilorhynchus) feeding on honeycomb surrounded by bees, Chayi, Taiwan. Controlled conditions
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.
Staffan Widstrand / Eurasian Hoopoe, (Upupa epops) coming out of burrow. Pusztaszer protected landscape, Kiskunsagi, Hungary, May
Alex Mustard / Saddleback anemonefish (Amphiprion polymnus) barks a warning as it guards a clutch of developing eggs (beneath it) laid on a small stone, below a fold in its home, a Haddon's sea anemone (Stichoda...
Simon Littlejohn / Griffon vulture (Gyps fulvus) regurgitating food for its chick, chick struggles to eat, Andalusia, Spain, June.
Dave Watts / Hoopoe (Upupa epops) male and female pair visiting nest to feed chicks, France
John Cancalosi / Canada Goose (Branta canadensis) on nest with goslings, New York, USA.
Andy Sands / Parasitic wasp (Monosapyga clavicornis) hovering in front of garden bee hotel looking for hosts nests while being watched by the Bee (Chelostoma campanularum) Hertfordshire, England, UK, June
John Cancalosi / Juvenile Timber rattlesnakes (Crotalus horridus) massed together at nest site, Pennsylvania, USA.
John Cancalosi / Timber rattlesnakes (Crotalus horridus) at nest site with young, Pennsylvania, USA.
John Cancalosi / Corn snake (Pantherophis guttatus) young hatching, captive. Maryland, USA.
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.
Dave Bevan / Atlantic puffin (Fratercula arctica) returning to nest site, falls over, Yorkshire, England, UK, May.
Dave Bevan / Pair of Grey wagtails (Motacilla cinerea) feeding nestlings and removing faecal sacs before flying out of frame, Carmarthenshire, Wales, UK, June.