Looks like your area is overrun with these beasties, My inlaws live in Stephenville, not too far from you. If you want a really target rich environment, go down there and hunt the city park along the Bosque River; it is overloaded with these critters. You would think that the town pride would rid the area of the varmints, but they don't seem to care. When I visit there, I always wonder why someone doesn't clean the place up. In Wyoming, we have some of the same problem, but not to the degree that the more 'civilized' areas seem to have. Good job on doing some cleanup, and a great post.