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

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

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...

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 / Great frigatebird (Fregata minor) male displaying inflated gular sac, Galapagos, Ecuador.

Doc White / Magnificent frigatebird (Fregata magnificens) colony nesting in mangroves, Magdalena Bay, Baja California, Mexico.

Roland Seitre / Magnificent frigate birds (Fregata magnificens) gathering to roost at dusk, Barbuda, Caribbean Sea.

Roland Seitre / Magnificent frigate bird (Fregata magnificens) perched on branch with wings spread, Barbuda, Caribbean Sea.

Roland Seitre / Magnificent frigate bird (Fregata magnificens) flying high against a blue sky and moon, Barbuda, Caribbean Sea.

Roland Seitre / Pair of Magnificent frigate birds (Fregata magnificens) at nest site, male with gular sac inflated to attract females, Barbuda, Caribbean Sea.

Roland Seitre / Male Magnificent frigate bird (Fregata magnificens) in flight with gular sac inflated, Barbuda, Caribbean Sea.

Roland Seitre / Male Magnificent frigate bird (Fregata magnificens) in flight with gular sac inflated, Barbuda, Caribbean Sea.

Roland Seitre / Male Magnificent frigate bird (Fregata magnificens) in flight with gular sac inflated, Barbuda, Caribbean Sea.

Roland Seitre / Male Magnificent frigate bird (Fregata magnificens) in flight with gular sac inflated, Barbuda, Caribbean Sea.

Roland Seitre / Male Magnificent frigate bird (Fregata magnificens) in flight with gular sac inflated, Barbuda, Caribbean Sea.

Bruce Thomson / Male Great frigatebird (Fregata minor) in breeding condition with semi-inflated throat pouch, Christmas Island, Australia.

Bruce Thomson / Male Great frigatebird (Fregata minor) in breeding condition with semi-inflated throat pouch, Christmas Island, Australia.

Bruce Thomson / Christmas Island frigatebird (Fregata andrewsi) flying, Christmas Island, Australia.

Bruce Thomson / Christmas Island frigatebird (Fregata andrewsi) flying, Christmas Island, Australia.

Bruce Thomson / Christmas Island frigatebird (Fregata andrewsi) in flight, Christmas Island, Australia.

Maxime Aliaga / Magnificent fregatebird (Fregata magnificens), San Cristobal Island, Galapagos

David Pattyn / Magnificent frigatebirds (Fregata magnificens) stealing fish from man carrying crate of fish, Puerto Lopez, Ecuador. Highly commended in the Garden and Urban Birds Category of the Bird photographer of...

Francisco Marquez / Frigatebird (Fregata magnificens) perched on agave flower at night, Islas Marias Archipelago, Marias Biosphere Reserve, Mexico.

Lynn M. Stone / Magnificent frigatebird (Fregata magnificens) male displaying with throat pouch inflated, perched in Red mangrove (Rhizophora mangle) tree. St. Petersburg, Tampa Bay, Florida, USA. August.

Jeff Vanuga / Magnificent frigate birds (Fregata magnificens) flying around the Galapagos Islands.

Doug Perrine / Great frigatebird (Fregata minor palmerstoni) group perched in vegetation, males in courtship display with inflated red throat pouch. Eastern Island, Midway Atoll National Wildlife Refuge, Papahanaumo...

Doug Perrine / Great frigatebird (Fregata minor palmerstoni) nesting and displaying in tree alongside nesting Red-footed booby (Sula sula). Laysan albatross (Phoebastria immutabilis) chicks in foreground. Eastern Is...

Doug Perrine / Great frigatebird (Fregata minor palmerstoni) colony, males in courtship display with inflated red throat pouches. Eastern Island, Midway Atoll National Wildlife Refuge, Papahanaumokuakea Marine Natio...

Doug Perrine / Magnificent frigate bird (Fregata magnificens) flock and Pink-footed shearwater (Ardenna creatopus) gathering around Olive ridley turtle (Lepidochelys olivacea) to feed on Bait fish hiding under it. P...

Doug Perrine / Magnificent frigate bird (Fregata magnificens) in flight. Over Pacific Ocean, Southern Costa Rica.

Doug Perrine / Magnificent frigate bird (Fregata magnificens) feeding from above and Yellowfin tuna (Thunnus albacares) feeding from below on Sardine bait ball. Splashes from Sardines attempting to escape. Sport fis...

Doug Perrine / Magnificent frigate bird (Fregata magnificens) feeding from above and Yellowfin tuna (Thunnus albacares) feeding from below on Sardine bait ball. Sardines making sea surface boil as they attempt escap...

Doug Perrine / Magnificent frigate bird (Fregata magnificens) feeding from above and Yellowfin tuna (Thunnus albacares) feeding from below on Sardine bait ball. Sardines making sea surface boil as they attempt escap...

Tui De Roy / Magnificent frigatebird (Fregata magnificens) in flight, with beakful of hatchling sea turtles, with some dropping out of beak. Las Bachas, Santa Cruz Island, Galapagos,

Tui De Roy / Magnificent frigatebird (Fregata magnificens) catching dropped hatchling sea turtle, Las Bachas, Santa Cruz Island, Galapagos,

Tui De Roy / Great frigatebird (Fregata minor) in tree with pair of Nazca boobies (Sula granti) showing mating behaviour, Genovesa Island, Galapagos,

Tui De Roy / Magnificent frigatebirds (Fregata magnificens) diving for fish prey, Borrero Bay, Santa Cruz Island, Galapagos.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) in flight, Rabida Island, Galapagos.

Tui De Roy / Magnificent frigatebird (Fregata magnificens) attacking Blue footed booby (Sula nebouxii) feeding chick. This bird is trying to steal the food from the parent. Santa Cruz Island, Galapagos.

David Tipling / Great frigatebird (Fregata minor) two perched on branch, St Francois Atoll, Seychelles

David Tipling / Great frigatebird (Fregata minor) in flight, St Francois Atoll, Seychelles

David Tipling / Masked booby (Sula dactylatra) returning to colony to feed chick attacked by Lesser frigatebird (Fregata ariel) to force booby to regurgitate fish, Wizard Island, Cosmoledo Atoll. Seychelles

David Tipling / Masked booby (Sula dactylatra) returning to colony to feed chick attacked by Lesser frigatebirds (Fregata ariel) to force booby to regurgitate fish, Wizard Island, Cosmoledo Atoll. Seychelles

David Tipling / Masked booby (Sula dactylatra) returning to colony to feed chick attacked by Lesser frigatebird (Fregata ariel) to force booby to regurgitate fish, Wizard Island, Cosmoledo Atoll. Seychelles