... phase. Polarization Sky compass Straight-line orientation Vision Many animals use the sun or the moon to orient their movements ( Papi and Pardi, 1963 ; Frisch, 1967 ; Schmidt-Koenig, 1990 ; Dacke et al., 2014 ). When the sun is not directly visible, its position can be estimated...

... and thus probably acts as an internal polarization compass. We investigated whether other sky compass cues like direct sunlight or the chromatic gradient of the sky might contribute to this compass. We recorded from polarization-sensitive CX neurons while an unpolarized green or ultraviolet light spot...

..., in which sky compass and idiothetic information disagreed, by training them in a straight channel that provided a change in e-vector direction. The results indicated that the polarization information completely dominates over idiothetic cues. Two path segments with different e-vector orientations...