The larva lives inside the protective casing and extends only its head and legs when it needs to move or feed. If disturbed, it quickly retreats back inside, making it difficult for predators to reach it.
The case itself is typically:
- Oval or flattened in shape
- Grayish or brownish in color
- Between 8 and 15 millimeters long
- Covered with dust and debris that help it blend into its surroundings
This clever disguise is one reason the insect often goes unnoticed for long periods.
5
Why Are They Inside Homes?
The presence of these larvae indoors is usually linked to available food sources.
Household casebearers feed on a variety of organic materials, including spider webs, hair, dead insects, natural fibers, and other debris commonly found in quiet corners of homes. Warm, humid environments provide ideal conditions for their development.
Because they are attracted to areas where dust and organic matter accumulate, they are often found:
- Behind furniture
- Along baseboards
- Near ceilings
- Inside closets
- Around stored fabrics
- In garages and storage areas