December 11, 1998

Songbirds' Breeding Success Tied to Their Winter Habitats

By KIM A. McDONALD

The precise reasons for the declines in numbers of many species of migratory birds have long puzzled scientists, who have debated for decades the relative importance of the birds' summer breeding areas and their tropical wintering grounds.

But in a report published in the December 4 issue of Science, researchers using a novel method to quantitatively assess the fitness of songbirds found that the habitats

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