Hi all! Chicken newbie here... I've got 5 chicks, all 5 1/2 weeks old. One each of Black Australorp, Buff Orpington, Delware, Golden Laced Wyandotte, and Barred Rock. We are letting them have free run of our front yard, but hoping to keep them contained in that space to keep them safe from both the traffic and from the stray dogs in the neighborhood. The fence is 6 feet all the way around. Do we need to clip a wing for each of our babies? I know they can easily get over a 4-foot fence, but a 6-foot fence? Also, if we need to clip a wing, when should we do that, at what age? Thanks in advance!!