Many birds that breed in mature forest are known to use early successional habitat to some extent during the postfledging period, but the degree of roosting use remains unclear for most species. In fact, for Neotropical migrant passerines, roosting ecology on the breeding grounds is largely undescribed. To determine female Worm-eating Warbler (Helmitheros vermivorum) breeding status, clearcut utilization, and roosting habitat during the breeding season, we attached radio transmitters to 19 female Worm-eating Warblers with fully developed brood patches caught in 8 year old clearcuts from 1 to 15 June 2016. Of the 19 radio-tagged females, 11 were found with dependent fledglings by 17 June: 5 individuals were considered to be independent (i.e., foraging and moving through the landscape without fledglings) and 6 (3 with fledglings and 3 without) to be transitory (i.e., located <5 times before the signal was lost). Nest-searching and telemetry data suggest that the postfledging period may have started by 28 May 2016 for some Worm-eating Warblers. Overall habitat use of radio-tagged female Worm-eating Warblers differed, with 2 individuals associated with clearcut habitat, 3 associated with mature forest habitat, and 8 showing variable use of edge/both habitat classes. We recorded 116 different roost locations for 18 radio-tagged females in clearcut, mature forest, and edge habitats (55, 42, and 19 locations, respectively). Overall habitat preference differed among individuals, but our study suggests that early successional young forest habitat may serve an important role in Worm-eating Warbler roosting and postfledging ecology.

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