Tracking tiny songbirds across continents

A pair of newly published papers in The Condor: Ornithological Applications lay out a method for outfitting birds with geolocators or radio transmitters that cuts precious weight from the package, allowing the devices to be used on very small birds, and demonstrate that the trackers do not harm the birds or impede their migration. Henry Streby of the University of California, Berkeley, and Sean Peterson of the University of Minnesota led a team of researchers to carry out the studies, which could make it easier than ever before to identify the migratory routes and wintering ranges of small songbirds such as warblers.

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