A long-distance migratory shorebird breeds in the temperate and sub-Arctic regions of the Northern Hemisphere. During migration, it uses dry uplands and feeds on insects and seeds, while in winter, it is commonly found in marshes and coastal mudflats, feeding on worms and crabs. The Eurasian form has a white rump, whereas the North American race has a dark rump. It belongs to the genus Numenius.
Which one of the following is being described?