I have had success with using short 2' high plastic fencing on short 3' metal stakes. I used the black plastic square fencing which is hardly noticable. This is easily removed at different times of year, or simply open a "gate" to let them in to help when appropriate. I also use raised beds (for my back's sake) and this will not stop them from taking bites out of the kale and cabbages. As Miss Lydia said, at the end of the season, they do a wonderful job of helping to clean up and fertilize. I live up in northwest Washington state and was amazed at the size of slugs that live up here. Now after several years, I rarely see the big ones, and the ducks can spot the little ones just hatched. I have only had 3 birds, but now have added 4 more who will be working for me next year.