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.