This Grotes Underwing Moth is a true underwing. The forewing gives them camouflage to rest on tree trunks during the day. When they take off, the colors are striking of the underwing. Found in woodland areas with mature Aspen trees along with Poplars, Cottonwoods, or Willows. They are native to Arizona, Utah, Colorado and other parts in western U.S. Eggs will overwinter under the bark of trees. The caterpillars feed on tree leaves. Adults feed on nectar of Groundsel flowers, mostly at night, sometimes diurnal.