We have a massive tunnel system in our yard and both neighbor's yards on either side of us. I bought traps and was successful. We caught four today so far. I haven't caught any in the tunnels that I have already caught one in. Should I cover the openings after I kill one and abandon that particular area? Thanks in advance and for anyone needing help with these critters, I am using two brands of traps but they are both the exact same. Sweeney and the other one is Victor brand. Will post pic. Just be sure to drive a stake in the ground, attach baling wire or something not easily broken to the trap and to the stake or the gopher will take your trap straight down the tunnel unless it is killed immediately.