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We don't want Maggies bag to disintegrate
The species of bagworm I have seen in the UK have drab little moths, but the female doesn't emerge. She mates whilst still entombed in the bag and the resulting caterpillars munch their way out. Interesting, as in all(?) other insects eggs are only fertilised during the process of laying. Like seeds, they have a micropyle and sperm is stored in a bursa copulatrix.