Birds of a feather don’t always flock together: variation in molt origins and movement patterns of winter finches in Ontario

For irruptive or facultative migrants in the subfamily Carduelinae, the winter finches, seasonal movements are extensive but have been poorly described in North America. We used stable hydrogen isotope measurements of feathers (δ2Hf) collected in three regions in Ontario, Canada, during the winters of 2014–15 and 2015–16 to infer potential breeding origins of four species. We also deployed color bands to better understand migratory movements...