Fig. 2. The mean bearings of the echinoids. (A-C) Un-normalized bearings. (D-F) Bearings relative to the targets (represented in scale above each graph). Each red line shows the length and direction of the mean bearing for the four trials with one echinoid. The black lines show the means of these mean bearings. 95% confidence ellipses are shown in blue. Circles represent E. lucunter; triangles represent E. viridis.