Caterpillar Architects Build Protective Backpacks

The bagworm caterpillar is an insect that builds a protective case around itself using silk and plant material, which it then carries on its back for safety.

This remarkable behavior is exhibited by many species of bagworms found in various parts of the world. During their caterpillar stage, they use their bodies to produce silk, which they combine with leaves, twigs, and other debris from their surroundings to create a protective case.

The size of these cases can range from about 1/4 inch to over 2 inches, depending on the age and size of the caterpillar inside. The bagworms' unique behavior allows them to blend into their surroundings, making it difficult to notice them.