Roger Powell / Stone curlew (Burhinus oedicnemus) approaching nest of two eggs, Guerreiro, Castro Verde, Alentejo, Portugal, April

Roger Powell / Stone Curlew (Burhinus oedicnemus) pair walking through a flower meadow, Castro Verde, Portugal, April

Wild Wonders of Europe / Lesniewski / Stone curlew (Burhinus oedicnemus) Bagerova Steppe, Kerch Peninsula, Crimea, Ukraine, July 2009

Wild Wonders of Europe / Lesniewski / Stone curlew (Burhinus oedicnemus) by nest, Bagerova Steppe, Kerch Peninsula, Crimea, Ukraine, July 2009

John Cancalosi / Stone curlew (Burhinus oedicnemus) calling on nest. England, UK, Europe

John Cancalosi / Stone curlew (Burhinus oedicnemus) at nest with eggs. UK

Melvin Grey / Senegal thicknee (Burhinus senegalensis), leucistic. Gambia, Africa.

Loic Poidevin / Spotted thick-knee (Byrhinus capensis) in bush, Masai Mara, Kenya.

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

Robin Chittenden / Great stone-curlew (Burhinus recurvirostris / Esacus recurvirostris) Sri Lanka.

Robin Chittenden / Great stone-curlew (Burhinus recurvirostris / Esacus recurvirostris) Sri Lanka.

Nick Upton / Stone curlews (Burhinus oedicnemus) group of four standing among volcanic rocks in steppe scrubland at dawn, Teguise Plain, Lanzarote, Canary Islands, February.