Case Moths are fascinating caterpillars that spun their own mobile homes from silk and often attach materials like leaves and twigs for camouflage and protection.
Case moths belong to the family Psychidae that includes Bag Moths.
For more information read this.
Here are four examples I have encountered
An unnamed daughter sent me the image below, being one of many tiny strange cocoon creatures that hung down on silken webs from the ceiling of her abode. She was afraid that they may fall in her mouth while she was sleeping and perhaps take over her body. As this was the second summer of the manifestation, and she had not metamorphosed or become stranger than usual, I ruled out alien origin and checked Google for a natural cause.
I found…“This is a Case Bearing Moth Larva. While they might be considered as household pests that could damage organic fibres like wool, they are most likely benign and feeding off shed pet hair, human hair and other organic debris like food crumbs in the home. The case is made of silk and incorporated particulate matter.”
I suspect that they thrive in vacuum cleaner-challenged homes.
Aileen and I were peacefully enjoying a cuppa on our front verandah, when I noticed a log cabin case moth caterpillar climbing the leg of her chair. Seeing an opportunity to grab a great image without collateral damage, I took the adjoining photo. These critters can be seen hanging from twigs and leaves in Foxes Lair. It came from the paperbark tree in our front yard. If you look carefully, you can see its sleeping bag, the chewed ends of the twigs that it has glued to its home and even a dead insect that it has collected.
A friend found this one recently on a eucalypt, and kept it as it passed through the pupal stage to become an adult. It is a type of Ribbed Case Moth that does not attach anything to its silken home.
The adult male, with its clear wings is quite unlike any other moth I have seen. Apparently female moths may be wingless and return to the discarded case (see far left) and await a male.