The mating apparatus of male butterflies prevents other males from mating with a female by producing a chemical plug.

References

"The mating apparatus of the male honeybee actually explodes and detaches, plugging the newly mated queen and preventing other males from mating with her. A number of insects, including butterflies, have chemical mating plugs which serve the same purpose and may even provide nutrients that the female absorbs and uses for egg production." (Forsyth 1992:32)

Book
Exploring the World of Insects: The Equinox Guide to Insect BehaviourCamden HouseMay 26, 2017
Adrian Forsyth

Living System/s

Organism
BothropolysGenus

Organism
InsectsLepidopteraClass