Prealternate molt intensity and timing in six Nearctic-Neotropical migratory warblers

In this study, we provided a detailed quantification of the timing and intensity of prealternate molt for six species of warbler (Family: Parulidae) on their nonbreeding grounds in Jamaica: Ovenbird (Seiurus aurocapilla), Northern Waterthrush (Parkesia noveboracensis), Black-and-white Warbler (Mniotilta varia), American Redstart (Setophaga ruticilla), Northern Parula (Setophaga americana), and Prairie Warbler (Setophaga discolor). We examined how molt intensity varied across the molting period and tested whether molt intensity varied across species, age, and sex classes. This repository contains the data (collected in winter 2023) used in the Journal of Field Ornithology publication of the same title (2025) and the R code for our analyses. See the publication for detailed methods on how the data and code were applied.