Jan Wegener / Straw-necked Ibis (Threskiornis spinicollis), Victoria, Australia

Felicity Lanchester,Felicity Lanchester / Mixed group of Cattle egrets (Bubulcus ibis), Great egrets (Ardea alba), African openbill storks (Anastomus lamelligerus) and Sacred ibis (Threskiornis aethiopicus) gathering to roost, Selous Game Res...

Axel Gomille,Axel Gomille / Black-headed Ibis / Oriental Ibis (Threskiornis melanocephalus), Karnataka, India

Axel Gomille,Axel Gomille / Black-headed Ibis / Oriental Ibis (Threskiornis melanocephalus), Karnataka, India

Anup Shah / Tawny eagle {Aquila Rapax} defending Lesser flamingo carcass from scavenging Sacred ibis{Threskiornis aethopicus} and Marabou storks {Leptoptilos crumeniferus} Lake Nakuru, Kenya.

Karine Aigner / Stomach contents of invasive Burmese pythons (Python bivittatus) are separated and laid out on sheets in order to identify them. Some of the contents seen here are the feet and feathers of a white ibi...

Karine Aigner / Stomach contents of invasive Burmese pythons (Python bivittatus) are separated and laid out on sheets in order to identify them. Some of the contents seen here are the feet and feathers of a white ibi...

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) foraging in grass, Vendee, France, October.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) flight, Vendee, France, October.

Loic Poidevin / African sacred ibis (Threskironis aethiopicus) catching an eel, Breton Marsh, Vendee, France, December

Loic Poidevin / African sacred ibis (Threskironis aethiopicus) Breton Marsh, Vendee, France, December

Loic Poidevin / African sacred ibis (Threskironis aethiopicus) catching an eel, Breton Marsh, Vendee, France, December

Loic Poidevin / African sacred ibis (Threskironis aethiopicus) catching an eel, Breton Marsh, Vendee, France, December

Andy Rouse / Black headed ibis (Threskiornis melanocephalus) standing on rock in lake with reflection, Ranthambhore, India.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) in grass, Vendee, France, September. Introduced species.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) Vendeen Marsh, France, November. Introduced species.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) walking, Marais Breton, Vendée, France, January.

Enrique Lopez-Tapia / Three Sacred ibis (Threskiornis aethiopica) and one African spoonbill (Platalea alba) flying, Orango National Park, Bijagos UNESCO Biosphere Reserve, Guinea Bissau.

Enrique Lopez-Tapia / A Sacred ibis (Threskiornis aethiopica) and two African spoonbill (Platalea alba) flying, Orango National Park, Bijagos UNESCO Biosphere Reserve, Guinea Bissau.

Enrique Lopez-Tapia / African Spoonbill (Platalea alba) Great egret (Ardea alba), gyptian geese (Alopochen aegyptiacus),Black herons (Egretta ardesiaca) and Sacred ibis (Threskiornis aethiopicus), Orango National Park, B...

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) calling in grass, with rings on leg, Breton Marsh, France, September. Introduced species.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) two on marsh in rain, Vendeen marsh, Vendee, France, January

Julian Hume / Reunion ibis (Threskiornis solitarius) Extinct c.1700. Endemic to Reunion Island, Mascarenes.

David Pattyn / African sacred ibis (Threskiornis aethiopicus) flying out of a tree, Gambia, Africa, May.

Enrique Lopez-Tapia / Sacred ibis (Threskiornis aethiopicus) two perched on tree. Lake Ziway, Rift Valley. Ethiopia.

Hanne & Jens Eriksen / African sacred ibis (Threskiornis aethiopicus) feeding in shallow water, Oman, February

Roger Powell / Straw-necked ibis (Threskiornis spinicollis) wading. Werribee Sewerage Farm, Victoria, Australia

Roger Powell / Straw-necked ibis (Threskiornis spinicollis) wading. Werribee Sewerage Farm, Victoria, Australia

Juergen Freund / Huge flock of Sulphur-crested Cockatoo (Cacatua galerita) and Straw-necked Ibis (Threskiornis spinicollis) flying after eating / digging peanuts from the newly ploughed fields. Atherton Tablelands, Qu...

Hanne & Jens Eriksen / African sacred ibis (Threskiornis aethiopicus) along the shore at a coastal lagoon, Oman, January

David Williams/ BIA / Black-headed Ibis (Threskiornis melanocephalus) wading, Sri Lanka

Bruno D'Amicis / African sacred ibis (Threskiornis aethiopicus) feeding on cultivated area on the shore of Shesher lake, Fogera Plains. Lake Tana Biosphere Reserve, Ethiopia. December 2013.

Bruno D'Amicis / African sacred ibis (Threskiornis aethiopicus) stretching wings in water, Fogera plains, Lake Tana Biosphere Reserve. Ethiopia.

Bruno D'Amicis / African Sacred Ibis (Threskiornis aethiopicus) flapping wings. Fogera plains, Lake Tana Biosphere Reserve, Ethiopia.

Ole Jorgen Liodden / African sacred ibis (Threskiornis aethiopicus) perched on branch, Lake Naivasha, Kenya.

Aflo / Australian white ibis (Threskiornis moluccus) in flight, Australia.

Sebastian Kennerknecht / Australian Ibis (Threskiornis moluccus) in palm tree, Royal Botanic Gardens, Sydney, New South Whales, Australia

Sebastian Kennerknecht / Australian Ibis (Threskiornis moluccus) sub-adult, Royal Botanic Gardens, Sydney, New South Whales, Australia

Loic Poidevin / Black-headed ibis (Threskiornis melanocephalus) feeding, Pench National Park, India.

Loic Poidevin / Black-headed ibis (Threskiornis melanocephalus) wading, Pench National Park, India.

Loic Poidevin / African sacred ibis (Threskiornis aethiopicus) in flight, Breton Marsh, France, December.

David Tipling / Sacred Ibis (Threskiornis aethiopicus) Lake Nakuru, Kenya.

Lou Coetzer / African sacred ibis (Threskiornis aethiopicus) in flight, Chobe River, Botswana, October.

Lou Coetzer / African sacred ibis (Threskiornis aethiopicus) with frog prey, Chobe River, Botswana.

Lou Coetzer / African sacred ibis (Threskiornis aethiopicus) in flight with food in beak, Chobe River, Botswana,

Lou Coetzer / Six African sacred ibis (Threskiornis aethiopicus) in flight against orange sky, Chobe River, Botswana.

Lou Coetzer / African sacred ibis (Threskiornis aethiopicus) in flight, Chobe River, Botswana.

David Williams / Black-headed Ibis (Threskiornis melanocephalus), Sri Lanka

David Williams / Black-headed Ibis (Threskiornis melanocephalus), Sri Lanka

Jan Wegener / Straw-necked Ibis (Threskiornis spinicollis), Victoria, Australia

Jan Wegener / Australian Ibis (Threskiornis moluccus) carrying branch to nest, Melbourne, Australia

Jan Wegener / Australian Ibis (Threskiornis moluccus), Melbourne, Australia

Loic Poidevin / Sacred ibis (Threskiornis aethiopicus) foraging in Breton Marsh, West France, July

Loic Poidevin / Sacred Ibis (Threskiornis aethiopicus) head in profile.The Vendeen Marsh, French Atlantic Coast, September.

Eric Baccega / Sacred Ibis (Threskiornis aethiopicus) perched on tree in sunset. Camargue Reserve, Rhone, France, September.

Axel Gomille / Black-headed / Oriental Ibis (Threskiornis melanocephalus) adult with large juvenile begging, Karnataka, India.

Charlie Summers / Sacred Ibis (Threskiornis aethiopicus) scouring a Kgalagadi waterhole for food, South Africa, May

Vincent Grafhorst / Sacred Ibis (Threskiornis aethiopicus) flying, Gaborone Game Reserve, Botswana

Luciano Candisani / Sacred Ibis (Threskiornis aethiopicus) landing in tree, Montagu, South Africa

Luciano Candisani / Sacred Ibis (Threskiornis aethiopicus), Montagu, South Africa

Andrew Walmsley / Rear view of Sacred ibis (Threskiornis aethiopicus) Sydney Botanic gardens, Australia, August

Rod Williams / Australian / Indonesian White Ibis (Threskiornis molucca) catching a pebble in its beak, to swallow and hold in its crop, Burleigh Heads, SE Queensland, Australia, March

Paul Hobson / Sacred ibis (Threskiornis aethiopeaus) in flight, Camargue, France

Tim Laman / Immature Black-headed Ibis (Threskiornis melanocephalus) on a riverbank, Sundarbans, Khulna Province, Bangladesh

Jouan & Rius / Australian white ibis / Indonesian white ibis(Threskiornis molucca) feeding, Kangaroo Island, South Australia, Australia

Jouan & Rius / Australian white ibis (Threskiornis molucca) Victoria, Australia

Hanne & Jens Eriksen / Oriental ibis {Threskiornis melanocephalus} in flight, Tamil Nadu, India

Hanne & Jens Eriksen / Oriental ibis {Threskiornis melanocephalus} in flight, Tamil Nadu, India

Jouan & Rius / Australian / Indonesian white ibis (Threskiornis molucca), Queensland, Australia

TJ Rich / Sacred ibis {Threskiornis aethiopicus} wading in water, South Luangwa NP, Zambia

Keith Scholey / Sacred ibis feeding in lake (Threskiornis aethiopicus) Lake Baringo, Kenya

Steven David Miller / Australian / Indonesian white Ibis {Threskiornis molucca} balancing on dead tree branch, Mapleton, Queensland, Australia.

Steven David Miller / Australian / Indonesian White Ibis {Threskiornis molucca} balancing on dead tree branch, Mapleton, Queensland, Australia.

Steven David Miller / Australian / Indonesian White Ibis {Threskiornis molucca} standing on dead tree branch over water, Queensland, Australia.

Hanne & Jens Eriksen / Indonesian white ibis {Threskiomis molucca} Kakadu NP, Australia.

Pete Oxford / Portrait of Aldabra scared ibis (Threskiornis aethiopica abbotti), Picard Island, Seychelles

Pete Oxford / Juvenile Aldabran sacred ibis {Threskiornis aethiopicus} abbotti Aldabra, Seychelles.

Bernard Castelein / Hadada ibis (Threskiornis aethiopicus) Lake Naivasha, Kenya

Roger Powell / Australian / Indonesian White Ibis (Threskiornis molucca) flying, Victoria, Australia

Roger Powell / Australian / Indonesian White Ibis (Threskiornis molucca) flying. Victoria, Australia

Roger Powell / Australian / Indonesian White Ibis (Threskiornis molucca) flying with nesting material. Victoria, Australia

Roger Powell / Straw-necked Ibis {Threskiornis / Carphibis spinicollis} in tree. Victoria, Australia.

Anup Shah / African fish eagle {Haliaeetus vocifer} defends Lesser flamingo carcass from Marabou stork {Leptoptilos crumeniferus} with Sacred ibis{Threskiornis aethopicus} nearby, Lake Nakuru, Kenya.

Roger Powell / Indonesian / Australian White Ibis (Threskiornis molucca) fighting, Victoria, Australia

Anup Shah / African fish eagle {Haliaeetus vocifer} defending Lesser flamingo carcass from scavenging Sacred ibis{Threskiornis aethopicus} and Marabou stork {Leptoptilos crumeniferus} Lake Nakuru, Kenya.

Anup Shah / African fish eagle {Haliaeetus vocifer} defends Lesser flamingo carcass from Marabou stork {Leptoptilos crumeniferus} with Sacred ibis{Threskiornis aethopicus} flying away. Lake Nakuru, Kenya.

Anup Shah / Tawny eagle {Aquila Rapax} defending Lesser flamingo carcass from Marabou storks {Leptoptilos crumeniferus} with Sacred ibis{Threskiornis aethopicus} in foreground and African Fish Eagle in background...

Andrew Parkinson / Sacred ibis {Threskiornis aethiopicus} Khwai river, Moremi GR, Botswana

Gerry Ellis / Straw-necked Ibis (Threskiornis spinicollis) perching on limb, surrounded by vegetation, Australia

Jabruson / Sacred ibis {Threskiornis aethiopicus} Lake Naivasha, Kenya

Peter Blackwell / Sacred ibis in flight {Threskiornis aethopicus} Masai mara NR, Kenya

Bernard Castelein / Sacred ibis landing {Threskiornis aethiopicus} Dunga, Lake Victoria, Kenya

John Cancalosi / Sacred ibis perched on palm, South Africa

Piotr Naskrecki / Sacred Ibis (Threskiornis aethiopicus) carrying nesting material, Gorongosa National Park, Mozambique

Juergen & Christine Sohns / Australian Ibis (Threskiornis moluccus), Mount Lofty, South Australia, Australia

Paul D Stewart / Illustrations of Sacred Ibis. Composite of three plates (by Balzac) from Cuvier's 'Ossamens Fossiles' 1812. Left - a mummy skeleton from Thebes, middle - the modern sacred ibis, right - an Egyptian te...