Fig. 3

Histories of 50 tundra swans implanted with satellite transmitters (PTTs) at 5 different breeding areas in Alaska in 2008. Stippled horizontal bars indicate number of days swans were known alive based solely on body temperature information. * designates birds assumed to be dead based on low body temperatures just before or at the time of final transmission. UK indicates a bird whose fate was in doubt, as the PTT battery voltage was not low when transmission ceased