MILBRIDGE — Biologists in Maine have attached tiny devices to 30 Arctic terns to learn more about their migratory routes.

Scientists with the U.S. Fish and Wildlife Service say birds on Maine’s Metinic Island and Eastern Egg Rock had devices known as “geolocators” attached to their legs last month. The biologists hope to catch the same birds next year, download the data and make maps of the migration route for each bird.

Biologists with the wildlife service’s Maine Coastal Islands National Wildlife Refuge say this is the first time the devices have been placed on Arctic terns in North America. The terns each year make a 25,000-mile round-trip between the northern and southern hemispheres.

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