We found two of these yesterday on our porch. One was 1 1/2" long and the other was 2 1/2" long! I placed them in two separate plastic disposable blueberry boxes and by morning the large one chewed it's way through. The second had almost chewed through as well. When I tried to release the second, he grabbed the plastic with his front pinchers (at mouth) with a very strong grip (eeeks! --- so be careful). Anyway, if anyone knows what it is, we would appreciate knowing.