Fig. 4. Distribution of downwind approach distances d, for different nest-feeder distances D. The histograms illustrate the distributions recorded at the nest-feeder distances given above the bin peaks (bin widths 0.5 m). Different histograms are distinguished by different shadings. For the different nest-feeder distances D, the numbers of recordings (n) and ant individuals (N) were as follows: D=5 m, n=747, N>21; D=10 m, n=420, N>24; D=20 m, n=668, N>29; D=40 m, n=127, N>8; D=50 m, n=41, N>11; D=60 m, n=165, N>10; D=75 m, n=6, N=3. Half widths of the distributions correspond to angles of 8.8° for D=5 m, 5.8° for D=10 m, 3.8° for D=20 m, 5.2° for D=40 m, 2.0° for D=50 m and 2.4° for D=60 m.