Fig. 4. 75% relative humidity (RH) – random check controls (A,B) and tests (C,D). Unimodal orientation away from the trained magnetic position of light was expected. As in the earlier experiment, controls failed to exhibit a consistent direction of orientation relative to the magnetic field in the dark (A) or in the light (B). Again, beetles trained to the directional light source and tested in the 90° rotated field were not oriented in the dark (C) but oriented in the expected magnetic direction in the light (D).