The Louisiana waterthrush (Parkesia motacilla) is a New World warbler, that breeds in eastern North America and winters in the West Indies and Central America. Plain brown above, it is white below, with black streaks and with buff flanks and undertail, distinguishing it from the closely related northern waterthrush. The habitats it prefers are streams and their surroundings, and other wet areas. Like the closely related northern waterthrush, the Louisiana waterthrush frequently bobs its tail.
It breeds in eastern North America from southernmost Canada and south through the eastern United States, excluding Florida and the coast. The Louisiana waterthrush is migratory, wintering in Central America and the West Indies. This is a rare vagrant to the western United States. They are one of the earlier neotropical migrants to return to their breeding grounds in the spring, often completing their migration in late March or early April, which is almost two months before most other warblers reach their breeding grounds. They are also one of the earliest warblers to vacate their breeding grounds, with some departing as early as July; almost all will have left by late August.