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Fig. 5. Results of magnetic impairment experiment. Each dot represents the angular difference between an individual turtle's mean heading on Day 2 versus Day 1. All four groups of turtles oriented in the expected direction of 0°. (A) No treatment; mean angle=11°, r=0.50, P<0.005 V-test, 95% confidence interval ±49°; (B) Brass bars; mean angle=26°, r=0.35, P<0.01 V-test, 95% confidence interval ±90°; (C) North-up magnets; mean angle=12°, r=0.46, P<0.025 V-test, 95% confidence interval ±56°; (D) South-up magnets; mean angle=357°, r=0.34, P<0.025 V-test, 95% confidence interval ±90°. See text for statistical comparison of distributions.