Fig. 3. Topographical layout of the terrace platform and its surroundings. The mean homeward courses of the ants starting at F9.5 and at the various release (R) sites (see Fig.1, Fig.2) and their extensions beyond the nest (N) area are included. The positions of trees, bushes and other conspicuous objects are marked. The lines labelled A, B and C indicate the positions of the screen used in the deprivation experiments. For further details, see text.