Fig. 4. Summer and autumn orientation of juvenile green turtles. Each dot within a circular diagram represents the mean angle of orientation for a single turtle during its 10-min trial. The triangle on the outside of each circle corresponds to the direction towards the capture area for each group of turtles. The broken lines represent the 95% confidence interval for the mean angle. (A) Orientation of green turtles tested between May and September 1998–1999. Turtles were significantly oriented with a mean angle of 50° (N=9, r=0.71, P<0.0025 V-test, 95% confidence interval ±37°). The confidence interval overlaps the direction to the capture site (74°). (B) Autumn orientation of green turtles tested in October and November 1998 and 2001. Turtles were significantly oriented with a mean angle of 199° (N=7, r=0.76, P<0.02 Rayleigh test, 95% confidence interval ±39°). This direction of orientation is consistent with that observed in wild turtles during the autumn migration.