David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from a fisherman coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from fishermen coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from fishermen coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

Andy Rouse / Magnificent frigate bird (Fregata magnificens) group flying against cloudy sky, Galapagos.

Ole Jorgen Liodden / Magnificent frigatebird (Fregata magnificens) male with gular pouch, Galapagos.

Ole Jorgen Liodden / Magnificent frigatebird (Fregata magnificens) in Galapagos

Tui De Roy / Magnificent frigatebirds (Fregata magnificens) in low flight ovehead. Espanola Island, Galapagos, Ecuador, December.

Ole Jorgen Liodden / Magnificent Frigatebird (Fregata magnificens) male displaying, red throat pouch inflated. Galapagos

Ole Jorgen Liodden / Magnificent Frigatebird (Fregata magnificens)displaying in flight, red pouch inflated. Galapagos

Gerrit Vyn / Adult male Magnificent Frigatebird (Fregata magnificens) displaying. Dry Tortugas NP, Florida, USA

Patrick Morris / Magnificent frigate bird {Frigata magnificens} pair on nest, male displaying with red throat pouch inflated, Genovesa Is, Galapagos

John Cancalosi / Magnificent frigatebird {Fregeta magnificens} male courtship display, Antigua, West Indies

Tui De Roy / Magnificent frigatebird (Fregata magnificens) in flight over sea between Isabela Island and Fernandina Island, Galapagos.

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) in flight, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from a fisherman coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

Sandesh Kadur / Magnificent frigatebird (Fregata magnificens) resting on the ground with red throat pouch inflated, Galapagos Islands, Ecuador.

Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) perched in Red mangrove (Rhizophora mangle) tree. Tampa Bay islet roosts, Tierra Verde, Pinellas County, Florida, USA.

Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) in flight with red pouch inflated Tampa Bay, Tierra Verde, Pinellas County, Florida, USA.

Lynn M. Stone / Magnificent frigate bird (Fregata magnificens) perched in Red mangrove (Rhizophora mangle) tree. Tampa Bay islet roosts, Tierra Verde, Pinellas County, Florida, USA.

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) colony, Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) juvenile landing, Espiritu Santo National Park, Sea of Cortez (Gulf of California), Mexico, February

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) hunting tuna, with scavenging Magnificent frigatebird (Fregata magnificens). A group of the sea lion bulls have learnt to herd Pelagic yellowfin tuna into a sm...

Michael Pitts / Magnificent frigate bird (Fregata magnificens) and Black-footed albatross (Phoebastria nigripes) fledged juveniles. Midway Atoll.

Tui De Roy / Blacktip shark (Carcharhinus limbatus) and Magnificent frigatebird (Fregata magnificens) following the tuna-hunting sea lion into the shallows, sometimes stranding themselves whilst hunting. A group...

Lucas Bustamante / Magnificent frigatebird (Fregata magnificens) juvenile on nest, North Seymour Island, Galapagos.

Roy Mangersnes / Magnificent frigatebird (Fregata magnificens) male displaying, red throat pouch inflated, North Seymour Island, Galapagos.

Roy Mangersnes / Magnificent frigatebird (Fregata magnificens) male displaying, red throat pouch inflated, North Seymour Island, Galapagos.

Roy Mangersnes / Magnificent frigatebird (Fregata magnificens) male displaying, red throat pouch inflated, North Seymour Island, Galapagos.

Roy Mangersnes / Magnificent frigatebird (Fregata magnificens) male displaying with red throat pouch inflated, Genovesa Island, Galapagos.

Roy Mangersnes / Close up of feathers of Magnificent Frigatebird (Fregata magnificens) male on Genovesa Island, Galapagos.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) female on nest, Galapagos, Ecuador.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) male portrait, Galapagos, Ecuador.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) male displaying inflated gular sac, Galapagos, Ecuador.

Pete Oxford / Magnificent frigatebirds (Fregata magnificens) in flight over shallow water, Halfmoon Caye, Lighthouse Reef Atoll, Belize.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) in flight, Halfmoon Caye, Lighthouse Reef Atoll, Belize.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) juvenile. Galapagos.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) male with pouch inflated. Galapagos.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) female and chick, Galapagos.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) male with pouch inflated on nest, Galapagos.

Pete Oxford / Magnificent frigatebird (Fregata magnificens) female perched on cliff, Galapagos.

Pete Oxford / Tourists photographing Magnificent frigatebirds (Fregata magnificens) at nesting colony with chicks.North Seymour Island. Galapagos.

Kim Taylor / Magnificent frigatebird (Fregata magnificens) swooping to snatch small fish off the beach. Tobago, West Indies.

Kim Taylor / Magnificent frigatebird (Fregata magnificens) snatching small fish off the beach. Tobago, West Indies.

Ross Hoddinott / Looking up at Frigatebird (Fregata magnificens) in flight, Galapagos, Ecuador. April.

Sam Hobson / Magnificent frigatebird (Fregata magnificens) in flight. Soufrière, Saint Lucia.

Angelo Gandolfi / Magnificent frigatebirds (Fregata magnificens), two females in flight, Santa Catarina, Brazil, September.

Will Burrard-Lucas / Magnificent Frigatebirds (Fregata magnificens) silhouetted at dusk, Little Cayman Island, Cayman Islands.

Michele Westmorland / Magnificent Frigatebirds (Fregata magnificens) flying at dusk, Wolf Island, Galapagos Islands.

Robin Chittenden / Magnificent Frigatebird (Fregata magnificens) in flight, Tobago, Trinidad and Tobago, April

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) on top of cardon cactus (Pachycereus pringlei), El Requeson beach, Bahia Concepcion, Sea of Cortez (Gulf of California), Mexico, April

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) preening on top of cardon cactus (Pachycereus pringlei), El Requeson beach, Bahia Concepcion, Sea of Cortez (Gulf of California), Mexico, April

Claudio Contreras / Californian sea lions (Zalophus californianus) in front of guano covered rocks with Magnificent Frigatebirds (Fregata magnificens). Espiritu Santo Island National Park, Sea of Cortez (Gulf of Californ...

Claudio Contreras / Californian sea lions (Zalophus californianus) in front of guano covered rocks with Magnificent Frigatebirds (Fregata magnificens). Espiritu Santo Island National Park, Sea of Cortez (Gulf of Californ...

Claudio Contreras / Californian sea lions (Zalophus californianus) in front of guano covered rocks with Magnificent Frigatebirds (Fregata magnificens). Espiritu Santo Island National Park, Sea of Cortez (Gulf of Californ...

Juan Carlos Munoz / Magnificent frigate bird (Fregata magnificens) in flight, Isla Holbox, Yucatan Peninsula, Mexico.

Tui De Roy / Magnificent frigatebirds (Fregata magnificens) in courtship behaviour, males inflating red gular pouches and females (white bib) observing. Espanola Island, Galapagos, Ecuador, June.

Tui De Roy / Magnificent frigatebirds (Fregata magnificens) flying overhead in formation against fluffy white clouds. Espanola Island, Galapagos, Ecuador, June.

Ole Jorgen Liodden / Magnificent Frigatebird (Fregata magnificens) male displaying. Galapagos

Ole Jorgen Liodden / Magnificent Frigatebird (Fregata magnificens) in flight. Panned action, Galapagos

Mark Carwardine / Magnificent Frigatebird (Fregata magnificens) male inflating neck pouch to attract a mate. January.

Pete Oxford / Magnificent Frigatebird (Fregata magnificens) perching on a mangrove branch. Sian Ka'an Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico.

Pete Oxford / Magnificent Frigatebirds (Fregata magnificens) in flight over mangrove trees. Sian Ka'an Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico.

Pete Oxford / Magnificent Frigatebirds (Fregata magnificens) in flight over mangrove trees. Sian Ka'an Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico.

Pete Oxford / Magnificent Frigatebird (Fregata magnificens) silhouetted in flight. Sian Ka'an Biosphere Reserve, Quintana Roo, Yucat‡n Peninsula, Mexico.

Staffan Widstrand / Magnificent Frigate (Fregata magnificens) male displaying by inflating his throat pouch. North Seymour, Galapagos, Ecuador, April.

Staffan Widstrand / Magnificent Frigate (Fregata magnificens) female with chick on nest. North Seymour, Galapagos, Ecuador, April.

Juan Carlos Munoz / Female Magnificent frigatebird (Fregata magnificens) feeding its chick. Galapagos Islands, Jan 2009

Juan Carlos Munoz / Magnificent frigatebird (Fregata magnificens) portrait. Galapagos Islands, Jan 2009

Juan Carlos Munoz / Magnificent frigatebird (Fregata magnificens) calling. Galapagos Islands, Jan 2009

Barrie Britton / Several male Magnificent frigate birds (Fregata magnificens) displaying with inflated throat pouches, in colony on mangrove. Frigate Bird Sanctuary, Barbuda. Taken during filming for BBC tv Series "S...

Barrie Britton / Female Magnificent frigate bird (Fregata magnificens) in flight, Frigate Bird Sanctuary, Barbuda. Taken during filming for BBC tv Series "Secrets of the Caribbean" October 2005

Barrie Britton / Male Magnificent frigate bird (Fregata magnificens) displaying with inflated throat pouch. Frigate Bird Sanctuary, Barbuda. Taken during filming for BBC tv Series "Secrets of the Caribbean" October...

Gerrit Vyn / Magnificent Frigatebird (Fregata magnificens) male with inflated gular sac in flight. Dry Tortugas NP, Florida, USA, March.

Gerrit Vyn / Magnificent Frigatebird (Fregata magnificens) female incubating on a nest. Dry Tortugas NP, Florida, USA, March.

Gerrit Vyn / Displaying adult male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac. Dry Tortugas National Park, Florida, USA

Gerrit Vyn / Male Magnificent Frigatebird (Fregata magnificens) in Spring, perched at breeding colony. Dry Tortugas NP, Florida, USA

Claudio Contreras / Female Magnificent frigate bird (Fregata magnificens) portrait, Contoy Island National Park, Caribbean Sea, Mexico, January

Claudio Contreras / Magnificent frigate bird (Fregata magnificens) male displaying to female, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico, December

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) two juveniles perched, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico, November

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) chick calling, Contoy Island National Park, Caribbean Sea, Mexico, April

Claudio Contreras / Magnificent frigatebird (Fregata magnificens) chick, Contoy Island National Park, Caribbean Sea, Mexico, April

Claudio Contreras / Magnificent frigate birds (Fregata magnificens) silhouetted, one in flight another on nest, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico, April

Barrie Britton / Silhouettes of Magnificant frigate bird {Fregata magnificens} males in aerial fight for nest material, Mexico

Barrie Britton / Magnificent frigate bird {Fregeta magnificens} male and chick, Isla Isabel, Mexico

Barrie Britton / Silhouette of Magnificent frigate bird {Fregata magnificens} stealing food from Brown booby, Mexico

Tim Laman / Magnificent frigate birds {Fregata magnificens} nesting rookery on protected mangrove island, Man-of-war Cay, Belize, May 2005

Tim Martin / Magnificent frigate birds (Fregata magnificens) following a Sailfish (Istiophorus albicans) to be led to large shoals of fish. Isla Mujeres, Caribbean, Mexico. January

Tim Laman / Magnificent frigatebird (Fregata magnificens) adult male. Santa Cruz Island, Galapagos Islands.

Tim Laman / Magnificent frigatebird (Fregata magnificens) female flying, seen from below. Santa Cruz Island, Galapagos Islands.

Tim Laman / Magnificent frigatebird (Fregata magnificens) adult male flying. Santa Cruz Island, Galapagos Islands.

Patrick Morris / Magnificent frigate bird {Fregata magnificens} male displaying with inflated throat pouch, Genovesa Is, Galapagos

Pete Oxford / Magnificent frigate bird (Fregata magnificens) juvenile, Seymour Is, Galapagos

Pete Oxford / Magnificent frigate bird chick (Fregata magnificens) Seymour Is, Galapagos

Pete Oxford / Magnificent frigatebird (Fregata magnificens) male courtship display, North Seymour Island, Galapagos

Pete Oxford / Magnificent frigatebird (Fregata magnificens) male courtship display with pouch inflated, North Seymour Island, Galapagos

Pete Oxford / Magnificent frigatebird juvenile (Fregata magnificens)North Seymour Island, Galapagos