My four girls (ISA browns) are about 11-12 weeks old now. I've had two of them fly up on things. One of the lid of the nesting box. I don't know who was more surprised, her (from the look on her face) or me. Then yesterday they saw my husband and I come home and got excited knowing it was food time. One of them flew up on the gate. The gate is about 18" shorter than the fence. Again, I think this one was surprised, too. But I know that when they see one do something it's chicken license for the others to do it. I'm afraid of finding a dead bird in the yard because one has flown the coop and my friendly, neighborhood hawk has gotten a meal. Should I clip their wings or is this an inevitable part of chicken wrangling? I was hoping they'd be older and bigger before I had to deal with this issue. BTW-the run is fenced (4' high) and covered.