Bence Mate / Great egrets (Ardea alba) sky pointing, sizing each other up before fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.

Andrew Parkinson / Gannet (Morus bassanus) adult 'sky-pointing' before flying out to sea. Saltee Islands, Republic of Ireland, May.

Tui De Roy / Marine iguanas (Amblyrhynchus cristatus) sky-pointing position to keep cool in sun. Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador, June.

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing during courtship dance, Galapagos Islands, Ecuador. Sequence 1 of 3

Laurent Geslin / Alpine newt (Triturus alpestris) swimming in garden pond, viewed from below, with woman and child watching. Switzerland, April 2010. Model released

Laurent Geslin / Alpine newt (Triturus alpestris) breathing at the surface of a garden pond, with mother and child observing, viewed from underwater, Switzerland. April 2010.

Edwin Giesbers / Northern gannet (Morus bassanus) sky pointing, Heligoland, Germany

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) pair sky pointing to keep cool in hot sun, Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in over heated sky pointing posture with lava flow entering sea, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in overheated sky-pointing posture with new lava flow, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Black-footed Albatross (Phoebastria nigripes) courtship dance, Midway Atoll, Hawaii

Marie Read / Northern gannets (Morus bassanus) performing sky-pointing display with outspread wings as part of courtship, Cape St. Mary's Ecological Reserve, Newfoundland, Canada. June.

Markus Varesvuo / Gannet (Morus bassanus) looking upwards or skypointing, close-up. Shetland, Scotland, UK. July.

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair sky-pointing during courtship at sunset, Sand Island, Midway Atoll, Midway National Wildlife Refuge, Papahanaumokuakea National Monument, Northwest Hawa...

Andy Rouse / Dalmatian pelican (Pelecanus crispus) group with wings spread and beaks pointing to the sky, in breeding plumage, Lake Kerkini, Greece, February.

Brais Seara Fernandez/ BIA / Razorbill (Alca torda) pair courting, Scotland, United Kingdom

Tui De Roy / Blue-footed Booby (Sula nebouxii) in courtship display, Seymour Island, Galapagos Islands, Ecuador

Brent Stephenson / Australasian gannet (Morus serrator) portrait, 'sky-pointing' before flying out to sea, Cape Kidnappers, Hawkes Bay, New Zealand, November.

Tui De Roy / Short-tailed Albatross (Phoebastria albatrus) subadults courting, Tsubamezaki, Torishima Island, Japan

Tui De Roy / Short-tailed Albatross (Phoebastria albatrus) pair of subadults courting, Torishima Island, Japan. Sequence 5 of 8

Cheryl-Samantha Owen / Cape gannets (Morus capensis) sky pointing about to take off, Bird Island Nature Reserve, Lambert's Bay, West Coast, South Africa.

Andrew Parkinson / Gannet (Morus bassanus) adult 'sky-pointing' before flying out to sea. Saltee Islands, Republic of Ireland, May.

Christophe Courteau / Blue footed boobies mating display {Sula nebouxii} Galapagos.

Juan Carlos Munoz / Great Egret (Ardea alba) sky pointing. Everglades National Park, Florida, USA, February.

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing during courtship dance, Galapagos Islands, Ecuador

Roger Powell / Northern gannet (Morus bassanus) sky-pointing, signalling that it wants to take-off from the colony, Great Saltee island, Wexford, Republic of Ireland, June

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) pair in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) in sky-pointing courtship display, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair engaged in courtship display, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) in sky-pointing courtship display, Galapagos Islands, Ecuador

Wild Wonders of Europe / della Ferrera / Purple heron (Ardea purpurea) pointing its beak to the sky, Krapje dol (Special ornithological reserve) Sava river, near Krapje village, Lonjsko Polje Nature Park, Ramsar Site, Sisack-Moslavina county...

Hugh Pearson / Cape gannet (Morus capensis) sky pointing, close-up of neck and underside of beak, Bird Island, off the coast of the Eastern Cape, South Africa, January

Hugh Pearson / Cape gannet (Morus capensis) sky pointing in colony, Bird Island, off the coast of the Eastern Cape, South Africa, January

JIM CLARE / White-naped crane (Grus vipio) with head pointing towards the sky, Zhalong Reserve, NE China, vulnerable species

Guy Edwardes / Northern Gannet (Morus bassanus) on nest "sky-pointing", Great Saltee, Co. Wexford, Republic of Ireland, June

Edwin Giesbers / Northern gannet (Morus bassanus) sky pointing, Heligoland, Germany

Pete Oxford / Waved Albatross (Phoebastria irrorata) displaying, Hood Island, Galapagos Islands, Ecuador

Tim Laman / Blue-footed booby (Sula nebouxii excisa) male performs sky-pointing display for female. Espanola / Hood Island, Galapagos, June

Yva Momatiuk & John Eastcott / Wandering Albatross (Diomedea exulans) adult sky calling during mating season, early fall, Prion Island, South Georgia, Southern Ocean, Antarctic Convergence

Yva Momatiuk & John Eastcott / Wandering Albatross (Diomedea exulans) adults sky calling, spreading wings, dancing, displaying, courting during mating season, early fall, Prion Island, South Georgia, Southern Ocean, Antarctic Conve...

Yva Momatiuk & John Eastcott / Wandering Albatross (Diomedea exulans) adults, one sky calling, displaying, courting during mating season, early fall, Prion Island, South Georgia Island, Southern Ocean, Antarctic Convergence

Solvin Zankl / Northern gannets (Morus bassanus) sky-pointing in courtship display, Bass Rock, Scotland UK

Bernard Castelein / Blue footed booby pair sky pointing, part of mating dance ritual {Sula nebouxii excisa} Galapagos

Duncan Usher / Northern Gannet (Morus bassanus) skypointing during courtship display, Europe

Tui De Roy / Waved Albatross (Phoebastria irrorata) courtship display sequence, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing in performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Light-mantled Albatross (Phoebetria palpebrata) emitting sky-pointing courtship call, Monument Harbor, Campbell Island, New Zealand

Tui De Roy / Waved Albatross (Phoebastria irrorata) courtship display sequence, Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in overheated sky-pointing posture with new lava flow, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Short-tailed Albatross (Phoebastria albatrus) lone female attempting to court Black-footed Albatross (Phoebastria nigripes), Midway Atoll, Hawaii

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing in performing courtship dance, Seymour Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing during courtship display, Punta Vicente Roca, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) sky pointing during courtship dance, Punta Vicente Roca, Isabella Island, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in overheated sky-pointing posture with new lava flow, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Laysan Albatross (Phoebastria immutabilis) courtship dance sequence, Midway Atoll, Hawaiian Leeward Islands, Hawaii

Tui De Roy / Laysan Albatross (Phoebastria immutabilis) courtship dance sequence, Midway Atoll, Hawaiian Leeward Islands, Hawaii

GEORGETTE DOUWMA / Cape gannet 'sky pointing' as it moves through nest colony, Malgas Island South Africa

Mike Read / Blue footed booby sky pointing display {Sula nebouxii} Galapagos

Tui De Roy / King Penguin (Aptenodytes patagonicus) pair sky pointing in courtship display, Volunteer Beach, East Falkland Island, Falkland Islands

Tui De Roy / King Penguin (Aptenodytes patagonicus) pair sky pointing in courtship display, Volunteer Beach, East Falkland Island, Falkland Islands

Tui De Roy / King Penguin (Aptenodytes patagonicus) sky pointing in courtship dispaly, Volunteer Beach, East Falkland Island, Falkland Islands

Tui De Roy / King Penguin (Aptenodytes patagonicus) in sky pointing dispaly, Volunteer Beach, East Falkland Island, Falkland Islands

Tui De Roy / Nazca Booby (Sula granti) sky pointing, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) sky pointing, Gardner Islet, Floreana Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair courting, Punta Vicente Roca, Isabela Island, Galapagos Islands, Ecuador. Sequence 2 of 3

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair courting, Punta Vicente Roca, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair courting, Punta Vicente Roca, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Waved Albatross (Phoebastria irrorata) pair courting, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador, sequence 7 of 7

Tui De Roy / Waved Albatross (Phoebastria irrorata) pair courting, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador, sequence 6 of 7

Tui De Roy / Waved Albatross (Phoebastria irrorata) pair courting, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador, sequence 5 of 7

Tui De Roy / Waved Albatross (Phoebastria irrorata) pair courting, Punta Suarez, Espanola Island, Galapagos Islands, Ecuador, sequence 3 of 7

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair engaged in courtship display, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) in sky-pointing courtship display, Galapagos Islands, Ecuador

Tui De Roy / Auckland Island Cormorant (Leucocarbo colensoi) in sky-pointing courting display, Enderby Island, Auckland Islands, sub-Antarctica New Zealand

Tui De Roy / Laysan Albatross (Phoebastria immutabilis) courtship dance sequence, Midway Atoll, Hawaiian Leeward Islands, Hawaii

Doug Gimesy / Three Southern royal albatrosses (Diomedea epomophora) performing courtship behaviour on grass hillside, two sky pointing whilst the other calls, Campbell Island, Sub-Antarctic Islands, New Zealand, D...

Tui De Roy / Waved albatross (Phoebastria irrorata) pointing its beak to sky. Punta Suarez, Espanola Island, Galapagos Islands, Ecuador.

Tui De Roy / Male Nazca booby (Sula granti) performing sky-pointing courtship display, with flowering Yellow cordia (Cordia lutea) in background. Galapagos Islands, Ecuador.

David Tipling / Gannet (Morus bassanus) 'sky pointing', head portrait, Bempton RSPB Reserve, North Yorkshire, UK. June.

Tui De Roy / Red-footed booby (Sula sula), sky-pointing courtship display, Genovesa Island, Galapagos, South America.

Tui De Roy / Marine iguana (Amblyrhynchus cristatus) 'sky-pointing', a thermoregulatory posture to keep cool in the sun, Fernandina Island, Galapagos, South America.

Ashley Cooper / Man outside Vernadsky Station Ukrainian research base, signpost pointing to places across the world. Galindez Island, Argentine Islands, Antarctica. December 2019.

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair in courtship dance, one sky pointing. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawaiian...

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair sky pointing in courtship dance. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawaiian Isla...

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair in courtship, one sky pointing. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawaiian Islan...

Doug Perrine / Laysan albatross (Phoebastria immutabilis) group, two sky pointing in courtship. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawaiian Isla...

Doug Perrine / Laysan albatross (Phoebastria immutabilis) pair sky pointing during courtship, silhouetted on coast at sunrise. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Mo...

Doug Perrine / Black-footed albatross (Phoebastria nigripes) pair in courtship dance, one sky pointing with another albatross observing in background. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumok...

Doug Perrine / Black-footed albatross (Phoebastria nigripes) pair, one sky pointing in courtship dance. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument, Northwest Hawai...

Doug Perrine / Black-footed albatross (Phoebastria nigripes) pair in courtship dance, one sky pointing. Silhouetted on coast at sunset. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine Na...

Doug Perrine / Black-footed albatross (Phoebastria nigripes) pair sky pointing in courtship dance, on coast at sunset. Sand Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine National Monument,...

Doug Perrine / Hybrid Laysan albatross x Blackfooted albatross (Phoebastria immutabilis x nigripes) sky-pointing while courting Laysan albatross, within breeding colony. Sand Island, Midway Atoll National Wildlife R...