I have had chickens now for about a month. About 2 weeks ago I let them start free ranging. The problem that I am having is with them coming up on the back porch eating cat food. If I put a gate up at the bottom of the steps will that keep them off or will they just fly over it? Is there anything else I can do to keep them off the porch? The back porch is covered that's why I have the cat food there. Thanks.