Figure 4. Mean frequency (± SE) of fights (per 300 pairs) at 5 time periods for 10 days in 2003. All observations were made in the same soybean field. Observations were not made during rain, so the actual sample size for each time period differs (N = 10 days for 700, 1000, and 1300; N = 9 days for 1600 and 1900).