Well...I don't know for sure, but more than likely it's going to be a moth. I don't know of any butterfly cats that eat Brugs, and this looks pretty large. It's kind of hard to tell what it looks like from the top. Does it have a horn or any type of point on one end?
John, do a search for Caterpillars thru Binoculars, or something like that. There are butterfly books and I heard a while back that they were making a cat one. Peterson Field Guides have one too I think.
Yep, that surprised me! Sherman finally has a (new) book store with lotsa good stuff. I will want to get my hands on it and check it out before I buy at that price. Might be hard to find a used one but, will try.