If safe, foragers do OBSERVE (τ i minutes) with probability ω i, which leads to observational learning (OL, see below; (Fig. 1 b, second line). Otherwise, with probability 1−ω i, foragers will select one of the remaining actions. If foragers are not HUNGRY (stomach content is at a maximum capacity of 20 resource items), foragers will do NOTHING (1 min; Fig. 1 b, third line). Stomach contents are reset to zero at DIGESTIONTIME.