Green Sandpiper Tringa ochropus

Green Sandpiper
Green Sandpiper
The Green Sandpiper isn't green but has a darkish brown head, neck and wings speckled with small white spots and a white undercarriage. The beak and legs are said to be greenish.
Green Sandpiper
Green Sandpiper
Green Sandpiper
It breeds in northern Eurasia and winters in southern Eurasia/Africa.
Green Sandpiper
Green Sandpiper
Green Sandpiper
It also isn't a "sandpiper" (Actitis/Calidris species) but a "shank" (Tringa species). It is closely related to the Solitary Sandpiper but not to other Sandpipers.
Green Sandpiper With Pied Wagtail
Green Sandpiper With Pied Wagtail
Green Sandpiper With Mallard duck and duckling