Insect and Spider Identification: Upper Peninsula Caterpillar (who?) brown w black chevrons, 1 by GasposdesFan

GasposdesFan wrote:
These guys/gals are all over right now in the U.P. of Michigan. We've had an unusually warm and early spring, so everything is a bit early hatching and budding out. I have seen a lot of these lately, and they seem to like our front and back door. I'll post some pictures, because I've tried looking them up on enature (my primary ID website) and this new place I found (Discover Life), but no luck. Also skimmed the most recent posts here in case someone else has noticed them and asked. Fully expecting them to be some obvious critter I've overlooked, but I just cant figure them out!
We have a lot of pine (jack, red, and white), spruce (black and white), balsam fir, northern red oak, sugar and red maple in the area, as well as back yards on sandy soil. Hoping that might help. I'm wondering if this is a species that has a sort of boom-bust life cycle? I am seeing a lot of what I think are morning cloaks in the woods, but they are adults. Also think I've ID'd a spring azure (closest I can get, and will post that for confirmation next).

These two were on my front step, fixin to get squished if I didn't move them. So, I picked them up and my camera and took some pictures. I've got about averate sized hand for a medium sized female, for size comparison.