Fig. 4. Search distributions for an absent feeder that is normally placed between two cylinders. A white curtain surrounded the experimental arena. Starting pen was 45 cm from the feeder. (A) Tests with one small and one large training cylinder. (B) Tests with two equal-sized cylinders. The darkest area represents 7.97% of the search in the training condition (N=53 paths) and 3.99% in the test condition (N=57 paths). The mean X positions of the two distributions differ significantly (Student's t-test; P=0.002, t=3.24, d.f.=108) from each other and from the predicted food sites (Student's t-test; A: P=0.005, t=2.96, d.f.=52; B: P<0.001, t=10.43, d.f.=56).