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The article offers a study on stable hydrogen isotopes in feathers of rusty blackbirds (Euphagus carolinus) in Mississippi Alluvial Valley and coastal South Carolina and Virginia, and in museum specimens from 1879 to 1990 to determine a migratory connectivity. It says that modern and historical isotopic analyses show a difference in the breeding origins of birds wintering in those regions. Moreover, it suggests that wildlife management should be tailored on both breeding and wintering grounds.