The Greenshank, Tringa nebularia, is a wader in the large family Scolopacidae, the typical waders. Its closest relative is the Greater Yellowlegs, together with which and the Spotted Redshank it forms a close-knit group. Among them, these three species show all the basic leg and foot colours found in the shanks, demonstrating that this character is paraphyletic (Pereira & Baker, 2005). They are also the largest shanks apart from the Willet, which is altogether more robustly built. The Greater Yellowlegs and the Greenshank share a coarse, dark, and fairly crisp breast pattern as well as much black on the shoulders and back in breeding plumage. This is a subarctic bird, breeding from northern Scotland eastwards across northern Europe and Asia. It is a migratory species, wintering in Africa, south Asia, and Australasia, usually on fresh water. It breeds on dry ground near marshy areas, laying about four eggs in a ground scrape.

Greenshanks are brown in breeding plumage, and grey-brown in winter. They have long greenish legs and a long bill with a grey base. They show a white wedge on the back in flight. They are somewhat larger than the related Common Redshank. The alarm call is a loud trisyllabic whistle.

Like most waders, they feed on small invertebrates, but will also take small fish.