Time spent courting by males on days 1 and 2. Each data point (N = 39) represents the percentage of time an individual male spent courting (as averaged for the two stimulus females, and calculated from spot samples of male behaviour). The line indicates identical courtship effort on the two days.
Lehtonen et al. BMC Evolutionary Biology 2011 11:233 doi:10.1186/1471-2148-11-233