Figure 1.
Behavioral responses to simulated territorial intrusions. Vocal measures of aggression were average (a) number of songs, (b) number of trills, and (c) number of chips recorded per 10-min STI. Measures of physical aggression were average (d) number of flights per 10-min STI, (e) time spent within 5 m, (f) time spent within 2 m, (g) latency, and (h) distance of closest approach. Scores for individual birds are represented by circles (TS) or triangles (WS). Whiskers represent 1.5 times the inner quartile range. *p<0.005