For the past 2 years, these moths have made an impressive appearance in certain parts of western MT (Missoula and the Swan Valley in particular). Aptly named, the preferred host for the caterpillars is the Douglas-fir, but they can also be found on true firs or spruce. Aside from the large, feathery antennae (more typical of male moths), we are 100% confident that this individual is a male as the females have no wings! Females look like a big hair covered jelly bean with legs. Adult moths can be found from mid-August into October or later …so get used to seeing these guys by your porch light in the weeks ahead.
Photo by: Glenn Marangelo on 8/5/21 in Missoula, MT