Bedstraw hawk-moth caterpillar leaving the frass behindTypical sculpting of a frass pellet of a large caterpillarA thistle tortoise beetle larva carrying a mass of its own frass as a repugnatorial defence.This Lepidoptera larvae disposes of its frass that might attract predators or parasites.
Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter.
