Fluctuating asymmetry in the choice of forelimb used for rotating food into the cage. Foxes are ranked on the Y axis according to their average preference score. For each trial, a fox received a preference score: 0 if it used only the right forelimb; 0.5 if it used both; 1 for the left only. The abscissa shows the average score for ten trials. Horizontal lines indicate ±1 SE of the mean for each fox across the 10 replications.