Fig. 1. General percentage of proboscis extensions (%PE_G) from two different groups of animals that received either unscented or scented (50 µl l^-1) 1.8 mol l^-1 sucrose solution during a single trophallactic interaction. Asterisks indicate statistical differences (G-test, ^***P<0.001; see Results for details). The number of animals is given in parentheses.