Fig. 4. Z-shaped maze in a different orientation (in 2005, first and third leg pointing to the east, middle to the south) (see Materials and methods). (A) Open control. Expected orientation 315° (filled arrowhead), mean vectors: 319.1°/316.8°/317.1°/312.0 (at 1 to 4 m radii); not significantly different from expected 315° at all radii; v.l. 0.97/0.98/0.98/0.98; N=22, 22, 22, 13. (B) Maze with covered middle segment. Mean vectors: 276.1°/273.8°/272.2°/270.2°; v.l. 0.95/0.96/0.97/0.97; N=25, 25, 25, 18. Mean vectors not significantly different from expected 270° (open arrowhead) at all radii.