Bagworms are Caterpillars, the larvae of the Bagworm Moth. In late summer and early fall, the Bagworms build small bags of twigs, leaves and silk to hold their eggs over the winter. The bags can measure up to 2½ inches long.
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Caterpillars
Caterpillars are the larvae of moths and butterflies. Caterpillars can be smooth, hairy or spiky.