The green sandpiper (Tringa ochropus) is a small wader (shorebird) of the Old World.

The green sandpiper represents an ancient lineage of the genus Tringa; its only close living relative is the solitary sandpiper (T. solitaria). They both have brown wings with little light dots and a delicate but contrasting neck and chest pattern. In addition, both species nest in trees, unlike most other scolopacids.

Source: Wikipedia