Terek Sandpiper ; is a small migratoryPalearctic wader species, the only member of the genus Xenus. It is named after the Terek River which flows into the west of the Caspian Sea, as it was first observed around this area. This bird breeds near water in the taiga from Finland through northern Siberiato the Kolyma River, and migrate south in winter to tropical coasts in east Africa, south Asia and Australia, usually preferring muddy areas. It is a rare vagrant in western Europe, and particularly in autumn it is sometimes seen passing through the Marianas on migration; on Palau, further off its usual migration route, it is decidedly uncommon on the other hand.
Is a small, foraging shorebird in the genus Tringa. The English name for the tattlers refers to their noisy call. The genus name Tringa is the New Latin name given to the green sandpiper by Aldrovandus in 1599 based on Ancient Greek trungas, a thrush-sized, white-rumped, tail-bobbing wading bird mentioned by Aristotle. This tattler breeds in northeast Siberia. After breeding, they migrate to an area from southeast Asia to Australia. The grey-tailed tattler is closely related to its North American counterpart, the wandering tattler (T. incana) and is difficult to distinguish from that species. Both tattlers are unique among the species of Tringa for having unpatterned, greyish wings and back, and a scaly breast pattern extending more or less onto the belly in breeding plumage, in which both also have a rather prominent supercilium. Grey-tailed tattlers are strongly migratory and winter on muddy and sandy coasts from southeast Asia to Australia. They are very rare vagrants to western North America and western Europe. These are not particularly gregarious birds and are seldom seen in large flocks except at roosts.