My 12 week old girls flew up on top of our tractor coop last night and one by one jumped (about 2-4 feet) on top of our backyard fence and then jumped off into our way back yard! Grrr. . . Now, what? We moved the coop out into the middle of the yard (away from the fence) , which is not where we want it. I think we're going to need to clip the wings of these birds. I like to let them free range for most of the day, but we live in the city and while we have a well-behaved dog (for the most part, as far as chicken-eating goes), I can't swear to that about my neighbors' dogs. My chickens are getting bigger and stronger and I think they saw that big green area of grass and they obviously figured out how to get to it. I have read up a bit about wing-clipping and I think we need to do it being city-dwellers. Is 12 weeks too early?