Experimental set-up. A focal male (red) was given a choice between two different-sized females (green). During the five different audience treatments, an audience/rival male (blue) was presented during or before the 2nd part of the experiment. Each part consisted of two sequences of habituation and testing with switched side-assignments of the two stimulus females; for display purpose, only the first sequence of the 1st and 2nd part of a trial are depicted here. For details see main text.