Woodchuck returns for more kale

Last week, a woodchuck made it through a section of chicken wire that had become detached from the frame. I patched that up, but he pulled another section out this week. I fear that he is learning how to get into the garden frames. If my super-duper stapling job doesn't hold up, I think I will have to try setting up an electric fence to "unlearn" him. Update 10/18/12: The stapling job did the trick. I haven't had any further woodchuck incursions since.