Supplemental Figure 2: from Experimental manipulation of photoperiod influences migration timing in a wild, long-distance migratory songbird

The panel shows detection data from a receiving station for an individual bird. The colours represent various antennae at the station. Signal strength shows fledging hatch-year purple martin (first stage of post-fledging movement), where initiation of fledging is at 15:20 GMT on 29 July. Departure from the colony (second stage of post-fledging movement) was on 1 August at 11:56 GMT. The blank spaces demonstrate the moments that the bird left the detection vicinity of the receiver tower. The signal strength before fledge date shows the time that the bird spent in the cavity.