"The Psychidae (bagworm moths, also simply bagworms or bagmoths) are a family of the Lepidoptera (butterflies and moths).
The bagworm family is fairly small, with about 1350 species described. Bagworm species are found globally, with some,
such as the Snailcase Bagworm (Apterona helicoidella), settling continents where they are not native in modern times.

Another common name for the Psychidae is "case moths", but this is just as well used for the case-bearers (Colephoridae).
The names refer to the habits of the caterpillars of these two families, which build small protective cases in which they can hide."
[Wikipedia]