Incredible Journeys

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Science  08 Feb 2002:
Vol. 295, Issue 5557, pp. 981-983
DOI: 10.1126/science.1069824

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Tracking populations of migrating animals is laborious, particularly using traditional mark-and-recapture strategies. In his Perspective, Hobson details new work ( Rubenstein et al.) that describes a method based on the distribution ofH andC in the environment and in birds' feathers for tracking the migration patterns and intermixing of black-throated blue warbler populations.