Abstract
Astronomical orientation experiments have been carried out on adults and young of the earwig Labidura riparia. In the water, the earwigs 1. (1) assumed a correct landward orientation, concordant with their home shore; 2. (2) used both the sun and the moon as orienting cues (the sun compass at least is time-compensated); 3. (3) quickly forgot the direction of their home beach after a period of one week in the laboratory; and 4. (4) the landward direction in L. riparia is not determined genetically but is learned during the animal's life time and can be quickly changed.
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