Ranger Tony found this beautifully constructed cocoon attached to the stake of a tree protector. According to the helpful identifiers contributing to iSpot, it’s probably the vacated cocoon of the widespread Puss Moth, Cerura vinula. A master of disguise, the moth’s green caterpillar is well camouflaged among the willow it feeds on, and the cocoon, beautifully spun from silk, is covered with bits of wood to keep it hidden through the winter.
More information and photographs at Buglife.
Casual Assistant Ranger Sarah