Description of data file used for the study 'Individual aggression, but not winner-loser effects, predicts social rank in male domestic fowl' by Anna Favati, Hanne Lovlie and Olof Leimar. Corresponding author Anna Favati, anna.favati@zoologi.su.se File: winner_loser_data.txt The file contains duel outcomes and aggression scores in two experiments (A and B) and behavioural responses of male domestic fowl (Gallus gallus domesticus) to a novel arena test (NA) and a novel object test (NO). The dataset also contains information on the males' age and morphological characters. Empty cells indicate missing data. Column heading Explanation Id Identity number of the male ExpA Participated in experiment A (yes/no) ExpB Participated in experiment B (yes/no) FirstExp Which experiment the male participated in first (A/B) Experiment A PairA Pair number in duels, experiment A WLA Outcome of the duel, experiment A (won/lost) AggA1 Aggression score in an intruder test (0-6). Score A1-3 were taken before the duel in experiment A, score A4-6 were taken after the duel AggA2 AggA3 AggA4 AggA5 AggA6 Experiment B PairB Pair number in duels, experiment B WLB Social experience in experiment B (won/lost the duel) AggB1 Aggression score in an intruder test (0-6). Score B1-3 were taken before the duel in experiment B AggB2 AggB3 Int Mode of introduction to the group, experiment B OutcomeB Outcome of experiment B: became top dominant of the group (yes/no) OppB1 One of the opponents in Exp B group OppB2 The other opponent in Exp B group Morphological measures Age Age (years) Com Comb length (mm) Wei Body weight (g) Novel arena test Vig1 Vigilance in NA (no of observations, max = 40), trial1 Vig2 Vigilance in NA (no of observations, max = 40), trial2 Lat1 Latency to 5 subareas in NA (sec), trial 1 Lat2 Latency to 5 subareas in NA (sec), trial 2 Are1 No. of subarea transitions in NA, trial 1 Are2 No. of subarea transitions in NA, trial 2 Uni1 No. of unique areas visited in the NA, trial 1 Nocvel object test Uni2 No. of unique areas visited in the NA, trial 2 NO1 Latency to approach novel object (40 cm from object, sec), trial 1 NO2 Latency to approach novel object (40 cm from object, sec), trial 2 NOBin1 Binary NO response (yes/no approached < 40 cm within 60 sec), trial 1 NOBin2 Binary NO response (yes/no approached < 40 cm within 60 sec), trial 2