larval case

A larval case, also known as a casebearer, is a protective covering created by the larvae of certain moths (family Coleophoridae). After hatching, these larvae initially feed as leaf miners. As they grow, they construct cases from materials like leaves, twigs, silk, and their own excrement. These cases serve as camouflage and protection, and the larvae protrude from them to feed. The cases are attached to branches, fruits, or leaves and are where the larvae overwinter. Typical case shapes can resemble cigars or pistols. Most adult casebearers are small, pale brown or gray moths with a wingspan under 12 mm. Other insects, like casebearing leaf beetles, also create cases for their larvae using excrement for camouflage. Caddisfly larvae also construct protective cases from silk and debris, which they drag along as they move.123