Bagworm (likely evergreen bagworm)

Vegetated landscapes, especially evergreen trees and shrubs; larvae may wander onto walls, patios, and other surfaces.

The caterpillar feeds on foliage, particularly arborvitae, juniper, cedar, and other evergreens, while carrying a silken case covered with plant debris.

Larvae construct portable cases, extend their heads and legs to feed, and retreat inside when disturbed. Mature larvae attach the case to vegetation, pupate inside, and adults emerge to mate; females are wingless and remain in the case.

Usually harmless to people and pets, but heavy infestations can defoliate and weaken ornamental trees. They provide food for birds and parasitoid wasps.