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As reported in the Proceedings of the National Academy of Sciences, Hilker and her co-workers determined that when a female cabbage butterfly lays her eggs on a Brussels sprout plant and attaches her treasures to the leaves with tiny dabs of glue, the vigilant vegetable detects the presence of a simple additive in the glue, benzyl cyanide.
Here's the lurid Edgar Allan Poetry of it: that benzyl cyanide tip-off was donated to the female butterfly by the male during mating.