Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS, GDT 2011 competition

John Shaw / Great frigatebird (Fregata minor) male at nest site, with gular sac inflated to attract females. Genovesa Island, Galapagos, May.

John Shaw / Roseate spoonbill (Platalea ajaja) at its nesting colony site, in early morning light. St. Johns Management Area, Florida, USA, April.

John Chan / California least tern chick (Sternula antillarum browni) falling over as it runs towards its parent returning to nest site, Huntington Beach, California, USA, June.

Tui De Roy / Green turtle (Chelonia mydas) female digging nest, North coast, Santa Cruz Island, Galapagos

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), two on rock. Bird drying wings in foreground with other sitting on nest in background. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Red-footed booby (Sula sula), pair nest building in tree. Darwin Bay, Genovesa Island, Galapagos.

David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) arriving at nest site in a dead palm tree, climbs down to nest, Pantanal, Mato Grosso do Sul, Brazil.

John Chan / Honey bees (Apis mellifera) swarming on an old gas tank and establishing a new nest site within, with some individuals beating their wings to create air circulation, Southern California, USA, February...

Dave Bevan / Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May.

Dave Bevan / Slow motion clip of a Tawny owl (Strix aluco) leaving nest site in hollow tree, Carmarthenshire, Wales, UK, April.

Tui De Roy / Waved albatross (Phoebastria irrorata) group of three on nest, Punta Suarez, Espanola Island, Galapagos

Tui De Roy / Waved albatross (Phoebastria irrorata) pair in courtship display at nest site, Punta Suarez, Espanola Island, Galapagos

Tui De Roy / Atlantic yellow-nosed albatross (Thalassarche chlororhynchos) courtship display sequence. Gough Island, Gough and Inaccessible Islands UNESCO World Heritage Site, South Atlantic.

Tui De Roy / Atlantic yellow-nosed albatross (Thalassarche chlororhynchos). nesting amid Blechnum palmiforme tree ferns. Gough Island, Gough and Inaccessible Islands UNESCO World Heritage Site, South Atlantic.

Frederique Olivier / Close-up of a Light-mantled sooty albatross (Phoebetria palpebrata) building its nest, Macquarie Island, Sub-Antarctic Australia.

John Cancalosi / Female Timber rattlesnake (Crotalus horridus) at nest site with newborn young, Pennsylvania, USA, September.

Claudio Contreras / Great Frigatebird (Fregata minor) departing from nest, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Isl...

SCOTLAND: The Big Picture / Golden eagle (Aquila chyrsaetos) female flying into nest site with small branch, Glen Tanar Estate, Cairngorms National Park, Scotland, UK, June.

Cyril Ruoso / View of Komdodo dragon (Varanus komodoensis) from nest, Rinca Island, Komodo National Park, Indonesia. Non-ex

Theo Webb / Bonobo (Pan paniscus) lying in a day nest, Max Planck research site, LuiKotale, Salonga National Park, Democratic Republic of Congo.

Markus Varesvuo / Shag (Phalacrocorax aristotelis) at nest site, Norway

Rob Jordan / 2020VISION / Merlin (Falco columbarius) chicks at nest site. Sutherland, Scotland, June.

David Tipling / 2020VISION / Tim Appleton, Site Manager at Rutland Water, ringing a soon to fledge Osprey (Pandion haliaetus) chick from nest close to Rutland Water. UK, June.

Andrew Parkinson / 2020VISION / Great crested grebe (Podiceps cristatus) male mating with female who has shown her willingness to mate by lying on the nest site in front of a fishing platform, Derbyshire, UK, March, sequence 2/5

Mark Hamblin / 2020VISION / Hen harrier (Circus cyaneus) adult female diving to nest site, carrying nesting material, moorland habitat, Glen Tanar Estate, Grampian, Scotland, UK, June. Did you know? Although Hen harriers have be...

Andrew Parkinson / 2020VISION / Marsh harrier (Circus aeruginosus) chick at its nest site, defiant as it is approached by a licenced bird ringer, Sculthorpe Nature Reserve, Norfolk, UK, July 2010

Wild Wonders of Europe / Hamblin / White stork (Ciconia ciconia) pair before mating at nest site on old chimney, Rusne, Nemunas Regional Park, Lithuania, June 2009

Wild Wonders of Europe / Hamblin / White stork (Ciconia ciconia) pair at nest site on old chimney, Rusne, Nemunas Regional Park, Lithuania, June 2009

Wild Wonders of Europe / Hamblin / White stork (Ciconia ciconia) pair at nest site with chick, Lithuania, May 2009

Eric Baccega / Hoary marmot (Marmotta caligata) carrying grass to build nest, Banff National Park, Rocky Mountains, Alberta, Canada

Roger Powell / Black Guillemot {Cepphus grylle} with Sandeel fish in beak trying to entice a female to his nest site, Caithness, Scotland, UK

Andrew Parkinson / Razorbill (Alca torda) coming in to land on its cliff top nest site, Saltee Islands, Republic of Ireland, May

Andrew Parkinson / Two Kittiwakes (Rissa tridactyla) greeting one another after one returns to the nest site, Farne Islands, UK

Jouan & Rius / Northern gannet (Morus bassanus) flock in flight over nest colony site, Shetland Islands, Scotland, UK

Roger Powell / Hoopoe {Upupa epops} male calling and displaying above nest site, Castelo Branco, Portugal

Andrew Parkinson / Little owl {Athene noctua} fledged chick returns for a moment to its nest site, evening light, Derbyshire, UK

Nigel Bean / Gannet {Morus bassanus} flock in flight over nest colony site, Bass Rock , Scotland

Mark Moffett / Herdsman Ant (Dolichoderus cuspidatus) queen surrounded by guards, marches along as the ants shift the site of their nest, Malaysia

Tui De Roy / Blue-footed Booby (Sula nebouxii) family on nest site, Punta Suarez, Hood Island, Galapagos Islands, Ecuador

Tui De Roy / White Tern (Gygis alba) hovering in search of nest site, Midway Atoll, Hawaii

Tui De Roy / Blue-footed Booby (Sula nebouxii) courtship landing salute at nest site, Punta Vicente Roca, Isabella Island, Galapagos Islands, Ecuador

Shin Yoshino / Osprey (Pandion haliaetus) carrying branch to nesting site, Earthquake Lake, Idaho

Ashok Jain / Rose Ringed Parakeet looking out of nest hole. Keoladeo NP India (Psittacula krameri)

Charlie Summers / King cormorants (Phalacrocorax atriceps) in courtship behaviour at their nest site. Saunders Island, Falkland Islands.

Nick Upton / Female Kestrel (Falco tinnunculus) soliciting male to mate with her by crouching down on a cliff ledge near their nest site, Cornwall, UK, April.

JIM CLARE / Humboldt penguin (Spheniscus humboldti) group of three returning to nest site, clean after bathing and fishing. Punta San Juan, (Reserva Nacional de Islas, Islotes y Puntas Guaneras) Peru.

John Chan / California least tern (Sternula antillarum browni) returning to a nest site established next to to a decoy, Southern California, USA, May.

John Chan / Female Black-necked stilt (Himantopus mexicanus) returning to her nest site in a saltmarsh, Southern California, USA, May.

John Chan / Black-necked stilt (Himantopus mexicanus) leaving nest site, Southern California, USA.

John Chan / Black-necked stilt (Himantopus mexicanus) leaving nest site, Southern California, USA.

John Chan / Female Black-necked stilt (Himantopus mexicanus) maintaining nest site in salt marsh, Southern California, USA.

John Chan / Male California least tern (Sternula antillarum browni) returning to nest site to feed its chick, other parent takes off, Huntington Beach, California, USA, June.

Sven Zacek / Ural owl (Strix uralensis) female perched at nest site with nestling chick, Tartumaa, Southern Estonia. May.

Sven Zacek / Ural owl (Strix uralensis) nestling at top of nest site preparing to jump and fledge nest. Tartumaa, Southern Estonia. May.

Nick Upton / Common / Eurasian crane (Grus grus) pair 'Monty' and 'Sedge' with their young chick, being mobbed by an aggressive Avocet (Recurvirostra avosetta) for approaching too close to its nest...

Nick Upton / Avocet (Recurvirostra avosetta) harassing Common / Eurasian crane (Grus grus) 'Sedge' and her chick near the Avocet's nest site in marshland pool, Slimbridge, Gloucestershire, UK, June 201...

Brian Bevan / Slow motion clip of a male Kingfisher (Alcedo atthis) with a jack Pike (Esox lucius) prey near nest site, Bedfordshire, England, UK, July.

David Fleetham / Hawaiian sergeant (Abudefduf abdominalis), male guarding eggs at nesting site. Hawaii.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on nest with two chicks. Base Bolivar, Beagle Crater, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) swimming with nesting material in beak. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on rocks with nesting material in beak. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) swimming with nesting material in beak. Punta Gavilanes, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) coming ashore with nesting material, water spray in air. Punta Gavilanes, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) walking across rocks, carrying nesting material. Punta Gavilanes, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) with Slate pencil urchin (Eucidaris sp) in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) swimming with Slate pencil urchin (Eucidaris sp) in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), two on rocks. Bird with Slate pencil urchin (Eucidaris sp) in beak with more Sea urchins below. Other bird sitting on nest. Punta Albemarle, Isabela Islan...

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) swimming with Slate pencil urchin (Eucidaris sp) in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair with Starfish (Asteroidea) and Slate pencil urchin (Eucidaris sp) scattered at feet. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) with nesting material in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) coming ashore with nesting material in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) in mid-air. Coming ashore with Slate pencil urchin (Eucidaris sp) in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on nest looking at Galapagos marine iguana (Amblyrhynchus cristatus). Crab on rock below. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), Cape Douglas, Fernandina Island, Galapagos

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair at nest with seaweed in beaks. Carcasses surrounding nest. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) carrying nesting material on beach. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) carrying Seaweed to use as nesting material. Punta Albemarle, Isabela Island, Galapagos

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) carrying nesting material across rocks. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair at nest. Nest includes Seaweed, Sea urchins (Echinoidea) and Starfish (Asteroidea). Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair at nest. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair billing, at nest. Cape Douglas, Fernandina Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair at nest. Galapagos marine iguana (Amblyrhynchus cristatus) carcasses surrounding nest. El Nino resulted in starvation of iguanas. Cape Douglas, Fernan...

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on nest with another drying wings in background. Galapagos marine iguana (Amblyrhynchus cristatus) carcasses, a result of starvation caused by El Nino, sur...

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) carrying Starfish (Asteroidea) over rocks. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) carrying Starfish (Asteroidea). Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) swimming with Starfish (Asteroidea) in beak. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on nest. Starfish (Asteroidea) nuptial gifts present around nest. Punta Albemarle, Isabela Island, Galapagos. June 2017.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) on nest. Starfish (Asteroidea) nuptial gifts present around nest. Punta Albemarle, Isabela Island, Galapagos. June 2017.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), adult with two chicks at nest. Beagle Crater, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), adult and chick on nest. Beagle Crater, Isabela Island, Galapagos.

Tui De Roy / Blue-footed booby (Sula nebouxii) sitting on nest. Circle of guano around nest. Punta Pitt, San Cristobal Island, Galapagos. April 2016.

Tui De Roy / Blue-footed booby (Sula nebouxii) sitting on nest with hill in background. Circle of guano around nest. Punta Pitt, San Cristobal Island, Galapagos. April 2016.

Tui De Roy / Blue-footed booby (Sula nebouxii), pair looking at each other, at nest. Punta Pitt, San Cristobal Island, Galapagos. April 2016.