last week I noticed my watermellon vines drying up. thought it was lack of water. at one point vines were so healthy I coulndnt tell where the hills were. Went to water them and noticed dug out paths around the hills. some critter has been digging trenches above ground and shredding anything in the way. including vines. It has killed about 8 of 25 watermellons. Thought it might be a mole but these trenches about 3 inches wide are on the surface not under ground. And at one point he dug a tunnel right through a hill and out the other side. looked like an errant practice round went right through the hill but the trenches going to the hill were crooked and my green mountain barrel doesnt shoot crooked. anyone have an idea what type critter this might be. and more important, how does one harvest the little pest?