Together with Brian Smith of the USFWS Division of Migratory Birds Region 6 and colleagues, the Smithsonian Migratory Bird Center is deploying cell phone transmitters on Golden Eagles to understand the overwintering movements and the breeding locations of birds wintering in the Colorado-Wyoming region.
Migratory connectivity is critical information for understanding eagle biology, informing policy and for making management decisions. Currently, Golden Eagles are managed within Bird Conservation Region boundaries. However, this region hosts a mix of wintering eagles from different breeding populations, alongside year-round resident eagles, complicating complete and effective management decisions. Since birds that winter here also may be affected by factors on their breeding grounds, biologists are only getting half the story.
Preliminary data from Golden Eagles across the country suggests that mixing strategies may be more common than previously thought for wintering birds. Answering questions such as where wintering populations breed and what percentage of wintering birds are migratory is essential to effective management of Golden Eagles in this and other regions.
In December 2014, Mike Lockhart (contractor to USFWS) and his volunteers captured two hatch-year (born in 2014) male Golden Eagles near the Colorado-Wyoming border. Solar-powered GPS-GSM transmitters were deployed on both eagles. GSM (Global System for Mobile Communications) transmitters use the cellular network to transmit GPS locations of the eagle to the researcher.