The Algarve hosts red knot, common greenshank and turnstone. The call is a ringing "Klew-klew" similar to that of a greenshank. The water area encourages wading birds such as spotted redshank, greenshank, green sandpiper and curlew. In this Gunnerus was the first person to give a scientific name to the Greenshank. The Nordmann's greenshank, a rare and endangered species, was not available for molecular analyses. Visitors belonging to uncommon species of wader include jack snipe, greenshank and ruff. Notable species include brent goose, jack snipe, spotted redshank and greenshank. Others like sandwich tern, ringed plover, ruff and greenshank occur on migration during the autumn.