New waders visiting Madeira Island

Find differences between Greenshank and Marsh Sandpiper

On April 15th, in Lugar de Baixo pond several waders were seen by Madeira Wind Birds:
Black-winged Stilt Himantopus himantopus
Greenshank Tringa nebularia
Marsh Sandpiper Tringa stagnatilis - 1st record for Madeira?
Curlew Sandpiper Calidris ferruginea
Sanderling Calidris alba
Little Stint Calidris minuta
Common Sandpiper Actitis hypoleucos

Also around were 2 Little Egrets and 4 Common Terns.