SwainsonÂs thrush (Catharus ustulatus) is a neotropical migrant, and its breeding range includes mountain and coastal North America, north to the boreal forest regions of Alaska. Individuals then migrate southward into Mexico, Central America, and northwestern South America to spend the winter. Movements of individual thrushes can be determined by combining information from stable isotope ratios and molecular genetic markers. This photograph originally appeared on the cover of Ecological Applic
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