Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter.
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.
