Fig. 5. Results of oviposition tests. (A) In three different tests, the same two colours were presented with the same or differing polarisation angles (). (B) In three tests, stimuli with 45° and 90° polarisation angles were presented, either both of the same colour or of different colours. In both sets of tests, choices depend on both colour and polarisation. n is the number of choices in each test; asterisks mark choice distributions that differ significantly from chance (G-test, P<0.001).