A Spectacled Eider carrying a radio transmitter

A Spectacled Eider carrying an intracoelomic radio transmitter near the Colville River. To track the movements of Spectacled Eider and other waterfowl for extended periods of time, intracoelomic radio transmitters were surgically implanted in birds during the late 90s through the early 2010s. Since then, technology has advanced and attaching tracking devices to birds no longer requires surgery.