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...

Ole Jorgen Liodden / African Openbill (Anastomus lamelligerus) storks roosting at sunset. Okavango, Botswana, November.

Richard Du Toit / African openbill storks silhouetted at sunset {Anastomus lamelligerus} Chobe NP, Botswana, Africa

Ann & Steve Toon / Openbilled stork (Anastomus lamelligerus), Chobe National Park, Botswana, Africa.

Charlie Summers / Openbill Stork (Anastomus lamelligerus) with snail prey. Selous Game Reserve, Tanzania

Charlie Summers / Openbill Stork portrait (Anastomus lamelligerus) portrait, Selous Game Reserve of Tanzania

Sean Viljoen / African openbill (Anastomus lamelligerus) feeding, Khwai River, Moremi Game Reserve, Botswana.

Jen Guyton / African open-billed stork (Anastomus lamelligerus) sitting on a nest at the edge of the floodplain in Gorongosa National Park, Mozambique

Tony Heald / Open-billed stork (Anastomus lamelligerus) feeding on a water snail at sunrise. Chobe National Park, Botswana.

Ann & Steve Toon / Openbill stork (Anastomus lamelligerus), Chobe river, Botswana, September

Nate Chappell/ BIA / African Open-bill Stork (Anastomus lamelligerus), Chobe National Park, Botswana

Wim van den Heever / Yellow-billed stork (Mycteria ibis) portrait with storm clouds in the background and a flock of Open billed storks flying past (Anastomus lamelligerus) Zimanga Private Game Reserve, South Africa.

Wim van den Heever / African open bill (Anastomus lamelligerus) in flight with morning sunlight. Chobe National Park Botswana.

Neil Aldridge / African openbill (Anastomus lamelligerus) perched on the branch of a dead tree, Zibadianja Lagoon, Selinda Reserve, northern Botswana.

Neil Aldridge / African openbill (Anastomus lamelligerus) searching for food in the shallows of the Chobe River, Chobe National Park, Botswana.

Neil Aldridge / African openbill (Anastomus lamelligerus) walking on floating vegetation, Chief's Island, Okavango Delta, northern Botswana.

Bruno D'Amicis / African opennbill (Anastomus lamelligerus) juvenile birds in rookery, Tana Mtsili island. Lake Tana Biosphere Reserve, Ethiopia.

Bruno D'Amicis / African opennbill (Anastomus lamelligerus) juvenile birds in rookery, Tana Mtsili Island, Lake Tana Biosphere Reserve, Ethiopia.

Bruno D'Amicis / African opennbill (Anastomus lamelligerus) juvenile bird in rookery, Tana Mtsili Island, Lake Tana Biosphere Reserve, Ethiopia.

Bruno D'Amicis / African openbill (Anastomus lamelligerus) in flight. Jimma marshlands, Lake Tana Biosphere Reserve, Bahir Dar. Ethiopia.

Bruno D'Amicis / African openbill (Anastomus lamelligerus) in flight, Lake Tana Biosphere Reserve, Bahir Dar, Ethiopia.

Denis-Huot / Open-billed stork (Anastomus lamelligerus) displaying, Masai Mara Game Reserve, Kenya, October.

Will Burrard-Lucas / African openbill (Anastomus lamelligerus) standing in water, South Luangwa National Park, Zambia. March.

Lou Coetzer / African skimmer (Rynchops flavirostris) flying at African openbill (Anastomus lamelligerus) standing in shallow water, Chobe River, Botswana, August.

Lou Coetzer / African openbill (Anastomus lamelligerus) hunting, Chobe River, Botswana, October.

Lou Coetzer / African openbill (Anastomus lamelligerus) tossing food in to beak, Chobe River, Botswana, October.

Lou Coetzer / Long toed lapwing (Vanellus crassirostris) flying towards African openbill (Anastomus lamelligerus) in territorial defense, Chobe River, Botswana.

Winfried Wisniewski / African Open-bill Stork (Anastomus lamelligerus), South Luangwa National Park, Zambia

Winfried Wisniewski / African Open-bill Stork (Anastomus lamelligerus) calling

Christophe Courteau / African openbill stork {Anastomus lamelligerus}, Okavango Delta, Botswana.

Christophe Courteau / African openbill stork {Anastomus lamelligerus} in the Okavango Delta marshes, Botswana

Ole Jorgen Liodden / African Openbill storks (Anastomus lamelligerus) perched on branches. Okavango, Botswana, November.

Laurent Geslin / African openbill stork (Anastomus lamelligerus) flying over water, Botswana

Hanne & Jens Eriksen / African openbill stork {Anastomus lamelligerus} feeding, opening bivalve shell with beak, South Africa, August

Ann & Steve Toon / African Openbill stork (Anastomus lamelligerus) wading in river, Kruger National Park, South Africa

Richard Du Toit / African openbill stork (Anastomous lamelligerus) (right) and Giant kingfisher (Ceryle maxima) perched on stump, Chobe NP, Botswana, December

Richard Du Toit / African openbill stork (Anastomus lamelligerus) walking, Chobe NP, Botswana, December

ZSSD / African Open-bill Stork (Anastomus lamelligerus) stork native to Africa

Hanne & Jens Eriksen / African openbill stork (Anastomus lamelligerus) feeding in water, Kruger NP, South Africa

Barrie Britton / African openbill stork fishing, Uganda East-Africa

Piotr Naskrecki / African Open-bill Stork (Anastomus lamelligerus), Gorongosa National Park, Mozambique

Ole Jorgen Liodden / African openbill storks (Anastomus lamelligerus lamelligerus) group roosting in tree, silhouetted on sunset, Okavango, Botswana.

Pete Oxford / African Open-bill Stork (Anastomus lamelligerus), Moremi Game Reserve, Okavango Delta, Botswana

Staffan Widstrand / African openbill stork (Anastomus lamelligerus) with mouth open, portrait, Bigodi swamp, Kibale, Uganda.

Staffan Widstrand / African openbill stork (Anastomus lamelligerus) perched on branch, Bigodi swamp, Kibale, Uganda.

Ann & Steve Toon / African openbill (Anastomus lamelligerus) feeding in shallow water, Chobe National Park, Botswana.

Ann & Steve Toon / African openbill (Anastomus lamelligerus) taking flight from water's edge, Chobe National Park, Botswana.

Richard Flack / African openbill stork (Anastomus lamelligerus) wading in shallow water at waterhole searching for food, Kruger National Park, South Africa.

Loic Poidevin / African openbill stork (Anastomus lamelligerus) carrying clam in beak on river bank. Uganda. August.

Loic Poidevin / African openbill stork (Anastomus lamelligerus) stretching its wings. Uganda. July.

Charlie Hamilton-James / Person holding poisoned snails used to bait African openbill storks which are then sold for human consumption, Bunyala Rice Scheme, Kenya, Africa. November, 2015.

Charlie Hamilton-James / Conservationists rescuing two African openbill storks (Anastomus lamelligerus) used as decoys to attract other storks to poisoned bait, Bunyala Rice Scheme, Kenya, Africa. November, 2015.

Charlie Hamilton-James / African openbill stork (Anastomus lamelligerus) on the ground, possibly with legs tied and wings clipped to stop escape, used as decoy to attract other storks to poisoned bait, the line of snails on t...

Charlie Hamilton-James / Conservationists rescuing African openbill stork (Anastomus lamelligerus) with legs tied up, used as decoy to attract other storks to poisoned bait, Bunyala Rice Scheme, Kenya, Africa. November, 2015.

Charlie Hamilton-James / African openbill stork (Anastomus lamelligerus) with beak tied up, used as decoy to attract other storks to poisoned bait, Bunyala Rice Scheme, Kenya, Africa.

Tim Laman / Flock of African open-billed storks (Anastomus lamelligerus) in flight, Lake Manyara National Park, Tanzania.

Roland Seitre / African open-bill stork (Anastomus lamelligerus) portrait. August. Captive animal.

Guy Edwardes / Openbilled stork (Anastomus lamelligerus) in flight. Savuti, Chobe National Park, Botswana.

Guy Edwardes / Openbilled stork (Anastomus lamelligerus) hunting in wetland. Savuti, Chobe National Park, Botswana.

Tony Heald / Open-billed stork (Anastomas lamelligerus) silhouetted in flight, Chobe National Park, Botswana.