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Any insect of the moth family Psychidae, found worldwide, named for the baglike cases the larvae (seelarva) carry with them. The bag, which ranges in size from 0.25 to 6 in. (6–150 mm), is constructed from silk and bits of leaves, twigs, and other debris. The strong-bodied male has broad, fringed wings with a wingspread averaging 1 in. (25 mm). The wormlike female lacks wings. Bagworm larvae often damage trees, especially evergreens.
This entry comes from Encyclopædia Britannica Concise. For the full entry on bagworm moth, visit Britannica.com.
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