It's Raining Caterpillars

Jeffrey Miller, a Lepidoptera expert at Oregon State University, explains that caterpillars use silk as a lifeline all the time, not just when spinning cocoons. “They spin silk from a gland built into their multiple mouthpart bits. They use silk as a place (pad) to molt, when they are disturbed by wind,  when threatened by a predator, and when – those that must – lower themselves to the ground and look for a place to make their pupa,” he says.

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