Data for STIs matched against each other 5 times in succession at 24 h intervals.

The level and duration of aggression as well as percentages of immediate retreats and physical fights is given only for the 1st and 5th fights and also for a 6th fight staged 24 h later against either the same or an unfamiliar opponent (same opp., diff. opp.): 50%, 25–75%, 10–90% give the median, IQR and 10 and 90 percentiles respectively.