A Boreal Songbird's 20,000?km Migration Across North America and the Atlantic Ocean

摘要

Photo 2. A male blackpoll outfitted with a light-level geolocator near Whitehorse, Yukon Territory, Canada. The light-sensing stalk is visible, rising gently from the bird’s back.The device records and stores the time, date, and light exposure every few minutes for up to a year. From this information, researchers can estimate, within a few hundred kilometers, where the bird moved throughout its annual cycle for that year. Photo credit: Hilary A. Cooke.