Abstract

Western tent caterpillars respond to sounds of 300–2100 Hz by head flicking. The sound frequencies to which they are most sensitive match the flight sound of a fly parasite which lays eggs on the heads of caterpillars. Caterpillars on tents are more likely to head flick when stimulated by sound and have lower parasitization levels than fifth-instar caterpillars which have left the tent.

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