Well I only had two box traps out in a ditch that had a little rat sign in it and caught two more last night. I pulled them today after working 20 hours plowing snow, witch sucked but it was nice to come home and have a rat in each trap. I hate too over trap them out of this ditch this is the first rat sign I've seen around my place in years so I truly don't know how many too take from a spot. Any help would be appreciated I don't want to trap them out. What's your guys thoughts. The main run is only maybe 50 feet in length and according to the bubbles under the ice there seems to only be two den holes?