Cathy called me up from the basement this morning because she thought I might like to see this caterpillar on our back patio. It was crawling along the hose but then moved off onto some leaves and sticks, which looks a bit more natural. It is an American Dagger Moth Caterpillar (Acronicta americana). They feed on the leaves of various deciduous trees so I really shouldn’t have let it live, but I did. Apparently the hairs can cause skin irritation, so it’s something you probably don’t want to handle. I didn’t, so I cannot say whether or not it’s a serious problem.