What protective casing do most moth caterpillars form before entering the pupal stage?

Answer

A cocoon made of silk

Moths usually spin a cocoon made of silk, often incorporating surrounding leaves or debris for camouflage, within which they enter the pupal stage, whereas butterflies form an exposed chrysalis.

What protective casing do most moth caterpillars form before entering the pupal stage?
insectmothanatomycharacteristicphysical