Case moth is the name of Australian insects that make cases of material from the plants on which they feed. The cases are held together by silk. The male moths are able to fly and are attracted by a scent that the females emit from special glands. Females of many species cannot fly and never leave their cases. For this reason, they need an efficient way of attracting the males. They lay their eggs in the case. The young caterpillars escape through the lower end and are carried away on a silken thread by the wind. There are more than 100 species of case moths in Australia.