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Cossidae (goat moths, carpenter moths; subclass Pterygota, order Lepidoptera) Family of small to very large moths in which the mouth-parts are much reduced, the antennae are often bipectinate, and the medial vein is forked in the discal cell of both wings. A single female may lay many eggs. The larvae generally bore into trees, and pupation occurs in the tunnel. The larvae of Cossus cossus (goat moth) smell like a goat. The family has a widespread distribution and many species are found in Australia.