Rick Price / Beach stone-curlew (Esacus magnirostris) standing on exposed reef. Montgomery Reef, Doubtful Bay, The Kimberley, Western Australia.

Staffan Widstrand / Water thick-knee (Burhinus vermiculatus) portrait, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Tony Heald / Water thick-knee (Burhinus vermiculatus) Etosha National Park, Namibia, March.

Tony Heald / Water thick-knee (Burhinus vermiculatus) Etosha National Park, Namibia, March.

David Tipling / Eurasian Stone culew (Burhinus oedicnemus) drinking from pool in late evening light, Belchite Spain, July

David Tipling / Eurasian Stone curlew (Burhinus oedicnemus) drinking, Belchite, Spain July

David Tipling / Eurasian Stone curlew (Burhinus oedicnemus) bathing, Belchite Spain July

David Tipling / Eurasian Stone curlew (Burhinus oedicnemus) bathing, Belchite Spain July

David Tipling / Eurasian Stone curlew (Burhinus oedicnemus) drinking Belchite Spain July

David Tipling / Eurasian Stone curlew (Burhinus oedicnemus) in water at dusk, Belchite Spain July

David Kjaer / Stone-curlew (Burhinus oedicnemus) Spain, July

David Tipling / Eurasian stone curlew (Burhinus oedicnemus) next to water, Belchite, Spain, January.

Pete Oxford / Great thick-knee (Esacus recurvirostris) National Chambal Gharial Wildlife Sanctuary, Madhya Pradesh, India

Pete Oxford / Great thick-knee (Esacus recurvirostris) National Chambal Gharial Wildlife Sanctuary, Madhya Pradesh, India

Graham Eaton / Stone Curlew or Spotted Thicknee (Burhinus capensis) at dry watering hole. Murchison Falls National Park, Uganda, Africa. April.

Ann & Steve Toon / Water thick-knee (Burhinus vermiculatis), Zimanga private Game Reserve, KwaZulu-Natal, South Africa, May

Lou Coetzer / Water dikkop / thick-knee (Burhinus vermiculatus) portrait, Chobe River, Botswana, August.

Lou Coetzer / Water dikkop / thick-knee (Burhinus vermiculatus) in flight, Chobe River, Botswana.

Ann & Steve Toon / Water thick-knee (Burhinus vermiculatus) standing at water's edge with fish prey in beak, Zimanga Game Reserve, KwaZulu-Natal, South Africa.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis) drinking in river, Allahein River, The Gambia.

Charlie Hamilton-James / Conservationists holding dead birds, Water thicknee (Burhinus vermiculatus) and Ringed plover (Charadrius hiaticula) in foreground and Grey heron (Ardea cinerea) in background, all victims of illegal...

Charlie Hamilton-James / Conservationist holding Water thicknee / Water dikkop (Burhinus vermiculatus) poisoned by illegal pesticide spraying, to protect crops from feeding birds, Bunyala Rice Scheme, Kenya, Africa. November,...

Charlie Hamilton-James / Conservationists holding Grey heron (Ardea cinerea), juvenile, foreground, Ringed plover (Charadrius hiaticula) and Water thicknee (Burhinus vermiculatus) all victims of illegal aerial spraying of pes...

Charlie Hamilton-James / Conservationist holding Water thicknee / Water dikkop (Burhinus vermiculatus) poisoned by illegal pesticide spraying, to protect crops from feeding birds, Bunyala Rice Scheme, Kenya, Africa. November,...

Bernard Castelein / Pair of Senegal thick-knees (Burhinus senegalensis) in defensive posture, protecting their chick from cattle, Allahien River, Gambia, West Africa.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis), stretching wings after bathing, Allahein river, The Gambia.

Bernard Castelein / Two Senegal thick-knee (Burhinus senegalensis) calling, Allahein river, The Gambia.

Bernard Castelein / Senegal thick-knee ( Burhinus senegalensis) bathing in river, Allahein river, The Gambia.

Bernard Castelein / Senegal thick-knee (Burhinus senegalensis) walking through shallow water, Allahein river, The Gambia.