“…Point counts followed the variable circularplot method (Reynolds et al, 1980), with adjustments for distance sampling analysis (Buckland et al, 2001). Surveys began at sunrise and ended no more than 4 h later (Mills et al, 2000b), and were not conducted if weather conditions could affect bird activity or detectability. Counts were 5 min in length and began 1 min after reaching plot center.…”