Figure 7. Memory retention of free-flying bees after bees after exposure to scented sucrose solution.

The percentage of bees that extended their proboscis on the first presentation of an odor for the solution odor (linalool, LIO, black bars), a novel test odor (phenylacetaldehyde, PHE, gray bars), or both (dark gray bars) were measured in hive bees belonging to different age groups: 6/9 days old (A), 12/16 days old (B) and foragers (C). The asterisks indicate statistical differences in a G-test (** p<0.01, for details see the text). The number of observations is shown in parentheses.