Ive trapped and released for years also. They go to a huge local 409 acre park. The squirrels and chipmunks show up every year...an endless supply, huge population. We just simply dont have enough predators. I wish there was more hawks, foxes to keep these guys in check. But people see a fox and freakout, end up killing them. Mind you my trap is only for small critters...squirrels and cgipmunks. Perhaps rats but we dont have them in my area. If i forgot, and leave the trap out overnight i may catch a possum, i let those guys go in my yard.