One of our hens (7 month old Plymouth Rock) has been flying over the 6 foot fence to forage so I clipped her left wing per the instructions on BYC. I cut the 10 primary flight feathers with sizzors right above the 2nd set of feathers. Today I was putting out some food, and had placed it on the top of their feeding station, which is 3 feet off the ground. I was so surprised when she fluttered up to the top of the table. Do some chickens need both wings clipped? Any experienced advice welcome!