Tui De Roy / Nazca boobies (Sula granti) against dawn sky. Espanola Island, Galapagos, Ecuador, May.

Patrick Morris / Pair of Nazca boobies {Sula dactylatra granti} Espanola Is, Galapagos

Tui De Roy / Masked Booby (Sula dactylatra) courting pair on cliff nest, Wenman Island, Galapagos Islands, Ecuador

Christophe Courteau / Masked booby chick stretching wings {Sula dactylatra melanops} Galapapos.

Yukihiro Fukuda / Masked booby (Sula dactylatra) mating pair deciding where to lay their eggs, which they do directly on the ground, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) parent shading chick from harsh sunlight at nest, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) flying overhead, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) some flying over others on ground, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked boobies (Sula dactylatra), Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) head portrait, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) parent and young with beaks gaping to cool down in harsh sunlight, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked boobies (Sula dactylatra) on the ground, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) pair on beach, one calling, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) both parents take turns to brood eggs on ground nest, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) returning to brood solitary egg on ground nest, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Masked booby (Sula dactylatra) both parents take turns to brood solitary egg on ground nest, Christmas Island, Indian Ocean, July

Tui De Roy / Nazca booby (Sula granti) in flight, carrying a stone in its beak, possibly for nest-building. Punta Cevallos, Espanola Island, Galapagos Islands, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) juvenile begging parent to regurgitate fish. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) at colony on coastal cliffs. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) in flight over sea, Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) feeding juvenile offspring by regurgitating fish. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) feeding juvenile offspring by regurgitating fish. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) standing by tree. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) at nest with chick. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) feeding juvenile offspring by regurgitating fish. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca booby (Sula granti) in flight. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Nazca boobies (Sula granti) at colony on coastal cliffs. Espanola Island, Galapagos, Ecuador, May.

Tui De Roy / Waved Albatross (Phoebastria irrorata) and Nazca boobies (Sula granti) at mixed seabird nesting colony, Galapagos Islands

Sue Flood / Masked Booby chick (Sula dactylatra) Ducie Island, Pitcairn Islands, South Pacific

Steve Gettle / Masked Booby (Sula dactylatra), Galapagos Islands, Ecuador

Steve Gettle / Masked Booby (Sula dactylatra) flying, Galapagos Islands, Ecuador

John Abbott / Nazca booby (Sula granti) displaying, Espanola Island, Galapagos Islands

John Abbott / Nazca booby (Sula granti) on ground, Espanola Island, Galapagos Islands

Ole Jorgen Liodden / Nazca Booby (Sula granti) head portrait. Galapagos

Ole Jorgen Liodden / Nazca Booby (Sula dactylatra granti) pair in courtship display. Galapagos

Ole Jorgen Liodden / Nazca Booby (Sula granti) pair mutual grooming. Galapagos

Ole Jorgen Liodden / Nazca Booby (Sula granti) feeding young chick. Galapagos

Ole Jorgen Liodden / Nazca Booby (Sula dactylatra granti) with dark background. Galapagos

Bryan and Cherry Alexander / Visitor approaches Nazca booby (Sula dactylatra granti) on rock. Punta Suarez, Espanola, Galapagos, January.

Brent Stephenson / Masked Booby (Sula dactylatra) chick in fluffy down on a coral-rubble beach. Ducie Island, Pitcairn Group, September.

Brent Stephenson / Immature Masked Booby (Sula dactylatra) in flight seen in profile. Takutea, Cook Islands, November.

Staffan Widstrand / Masked Booby (Sula dactylatra) preening its feathers. Punta Suarez, Espaniola, Galapagos, Ecuador, April.

Pete Oxford / Nazca booby (Sula granti) adult feeding chick, Isla de la Plata, Machalla National Park, Ecuador

Jenny E. Ross / Head portrait of Nazca booby (Sula dactylatra granti) resting on its nest. Genovesa Island, Galapagos, Ecuador. May

Pete Oxford / Nazca booby (Sula dactylatra granti) standing on rock, Punto Cevallos, Española (Hood) Island, Galapagos islands, Equador, South America

Pete Oxford / Close up of Nazca booby (Sula dactylatra granti) eye, tucked behind wing, Punto Cevallos, Española (Hood) Island, Galapagos islands, Equador, South America

Murray Cooper / Masked Booby (Sula dactylatra) and tourist, Ecuador

Sue Flood / Masked booby chick (Sula dactylatra) Ducie Island, Pitcairn Island Group, South Pacific. October

Sue Flood / Masked booby chick (Sula dactylatra) Ducie Island, Pitcairn Island Group, South Pacific. October

Sue Flood / Masked booby (Sula dacylatra) taking off, Henderson Island, Pitcairn Island, South Pacific. October

Sue Flood / Masked booby (Sula dactylatra) Henderson Island, Pitcairn Island, South Pacific. October

Gerrit Vyn / Masked Booby (Sula dactylatra) incubating at nest. Dry Tortugas National Park, Florida, USA

Hanne & Jens Eriksen / Masked booby {Sula dactylatra} adult in flight, Oman

Tom Vezo / Masked / Blue faced booby (Sula dactylatra) chick, Hood Island, Galapagos

JIM CLARE / Non-breeding Masked booby (Sula dactylatra melanops) molesting chick, Galapagos NP, Ecuador

Hanne & Jens Eriksen / Masked booby {Sula dactylatra} adult in flight over calm water, Dhofar, Oman

Juan Carlos Munoz / Masked booby {Sula dactylatra} Espanola Island, Galapagos, January

Juan Carlos Munoz / Masked booby {Sula dactylatra} Espanola Island, Galapagos, January

Juan Carlos Munoz / Masked booby {Sula dactylatra} Espanola Island, Galapagos, January

Juan Carlos Munoz / Masked booby {Sula dactylatra} preening, Espanola Island, Galapagos, January

Juan Carlos Munoz / Masked booby {Sula dactylatra} perched on coast, Espanola Island, Galapagos, January 2009

Juan Carlos Munoz / Looking down on Masked booby {Sula dactylatra} at nest with eggs on coast, Espanola Island, Galapagos, January 2009

Hanne & Jens Eriksen / Masked booby (Sula dactylatra melanops) adult and fledgling. Daymaniyat Islands, Oman.

Hanne & Jens Eriksen / Masked booby (Sula dactylatra melanops) fledgling. Daymaniyat Islands, Oman.

Hanne & Jens Eriksen / Masked booby (Sula dactylatra melanops) adult and fledgling. Daymaniyat Islands, Oman.

Hanne & Jens Eriksen / Masked booby (Sula dactylatra melanops) adult in flight. Daymaniyat Islands, Oman.

Hanne & Jens Eriksen / Masked booby (Sula dactylatra melanops) Daymaniyat Islands, Oman.

Pete Oxford / Nazca booby (Sula dactylatra granti) pair on rock, Wolf Island, Galapagos Islands

Pete Oxford / Two Nazca boobies (Sula dactylatra granti) on coast, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Vampire / Sharp-beaked ground finch (Geospiza difficilis) feeding on blood from wound on Nazca booby (Sula dactylatra granti) Wolf Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula dactylatra granti) pair on rock, Wolf Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula granti) perched on rock, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Vampire / Sharp-beaked ground finch (Geospiza difficilis) feeding on blood from Nazca booby (Sula dactylatra granti) Wolf Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula dactylatra granti) on coast, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula dactylatra granti) pair on rock, Wolf Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula dactylatra granti) pair, mutual preening, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Nazca booby (Sula dactylatra granti) close up of eye, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Nazca boobies (Sula dactylatra granti) pair, mutual preening, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Two Nazca / Masked Boobies (Sula dactylatra granti) Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Nazca / Masked Booby (Sula dactylatra granti) on rock, Punta Cevallos, Española / Hood Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Nazca / Masked Booby (Sula dactylatra granti) on rocks, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Nazca / Masked Boobies (Sula dactylatra granti) courtship, Punta Cevallos, Española / Hood Island, Galapagos Islands

Pete Oxford / Waved Albatross (Phoebastria irrorata) with Nazca / Masked Boobies (Sula dactylatra granti) Punta Cevallos, Española Island, Galapagos Islands, (Endemic to Galapagos, Critically endangered)

Pete Oxford / Nazca / Masked Booby (Sula dactylatra granti) with wings stretched, Punta Cevallos, Española / Hood Island, South America

Pete Oxford / Nazca / Masked Booby (Sula dactylatra granti) portrait, Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Vampire / Sharp-beaked Ground Finch (Geospiza difficilis) feeding on blood from Nazca / Masked Booby (Sula dactylatra granti) Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Vampire / Sharp-beaked Ground Finch (Geospiza difficilis) on a Nazca / Masked Booby (Sula dactylatra granti) where it feeds on blood, Wolf Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Vampire / Sharp-beaked Ground Finch (Geospiza difficilis) feeding on blood from Nazca / Masked Booby (Sula dactylatra granti) Wolf Island, Galapagos Islands, Ecuador, South America

Tim Laman / Nazca Booby / masked booby (Sula dactylatra granti) mating pair, Espanola (Hood) Island, Galapagos Islands.

Tim Laman / Nazca booby / masked booby (Sula dactylatra granti) flying. Punta Vincente Roca, Isabela Island, Galapagos Islands.

Tim Laman / Nazca Booby / masked booby (Sula dactylatra granti) flying, Espanola (Hood) Island, Galapagos Islands.

Pete Oxford / Nazca booby / Masked booby flying {Sula dactylatra granti} Tower / Genovesa Is, Galapagos

Pete Oxford / Nazca booby / Masked booby {Sula dactylatra granti} head portrait, Tower / Genovesa Is, Galapagos

Pete Oxford / Nazca booby / Masked booby calling, beak open {Sula dactylatra granti} Tower / Genovesa Is, Galapagos.

Pete Oxford / Nazca booby / Masked booby preening {Sula dactylatra granti} Tower / Genovesa Is, Galapagos

Pete Oxford / Nazca / Masked booby on nest {Sula dactylatra granti} Tower / Genovesa Is, Galapagos