[citation needed] On the wintering grounds in Puerto Rico, northern waterthrushes leave daytime foraging areas and fly up to 2 km (1.2 mi) to nighttime roosts.[10] Northern waterthrush territories are distributed across both upland and riparian habitats, but have limited occupation of harvested areas.[11] The breeding habitat of the northern waterthrush is wet woodlands near water, especially rivers and streams.[12] Northern waterthrushes build a cup nest constructed of leaves, bark strips, and rootlets in cavities or among tree roots.[14][15] The song of loud, emphatic, clear chirping notes generally falling in pitch and accelerating; loosely paired or tripled, with little variation.[8] The first northern waterthrush recorded in Europe was a female trapped in Ushant, France on 17 September 1955.