In the clear: Weather drives the northward movement of American Tree Sparrows (Spizelloides arborea) as spring progresses

The American Tree Sparrow (Spizelloides arborea) is a sub-Arctic breeding species that spends the nonbreeding season in temperate regions of North America, and is a high-priority candidate for conservation status assessment. To provide new information about their movement ecology and migratory connectivity, we used automated radiotelemetry to track their movements and stable-isotope analysis of feathers to infer breeding or natal origin. The work is published in the Journal of Field Ornithology. In this repository, we include several datasets that support the work and an R script showing the geographical assignment procedure.