Their larvae (caterpillars) are quite dull by comparison to the adult form. Their underbellies are a rich chestnut brown with spiky hairs, while their dorsal side ("back") is a charcoal gray-black, covered with long, thin bristles or hairs. They feed on a wide variety of plant leaves from weeds, shrubs and trees. After a summer of feeding, they will hibernate over winter.
Both adults and larvae can be found in arboreal forests. Adult moths are attracted to lights at night, so they may also be seen in backyards, parking lots and other areas with artificial lighting.