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Birds' feathers reveal their winter diet

20:00 EDT 20 Jun 2017 | Physorg.COM

Influences outside the breeding season can matter a lot for the population health of migratory birds, but it's tough to track what happens once species scatter across South America for the winter months. A study from The Condor: Ornithological Applications tries a new approach for determining what declining migratory grassland birds called Bobolinks eat after they head south for the winter—analyzing the carbon compounds in their plumage, which are determined by the types of plants the birds consume while growing their feathers during their winter molt.

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