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

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 / 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