Figure 1.

Schematic of the foraging experiment's patch (A) layout and (B) dimensions. For each troop, patch food content, f, was varied between 11.4 ± 0.3 g/m² (low, first 14-day period) and 17.1 ± 0.3 g/m² (high, second 14-day treatment) of loose dried maize kernels. Interpatch distance (d) was varied with each 14-day period. In the first period, it was set at 25 m (short) for the starting 7 days and 50 m (long) for the remaining 7 days, and vice versa for the second period. Patch size was constant within troops. Large patches (A, D and E) were set at 80 m² (a = 10 m, b = 10 m, c = 6 m) for the small troop and 96 m² (10, 12, 6) for the large troop. Small patches (B and C) were set at 20 m² (5, 5, 3) for the small troop and 27 m² (6, 6, 3) for the large troop.