I got up today and went to check my babies (2 brooders - one for 3 - 4 weekers and one for 1-2 weekers) anyhow I noticed that there was what looked like a chicken poop on the plastic bin next to the bigger babies pen (about 3 feet tall) and it looked just like it would if a chicken was sitting on the top edge of the pen, anyhow they were all there so I fed and visited then went to have coffee. I came back and sat on a box next to the bin and was visiting with the littler babies when I heard a flapping noise. I turned my head and there was one of my mystrey chicks (still not sure what breed) sitting on the top edge of the pen with this gimormous smirk on it's face like it was saying "Oh, hi there, look at what I can do now!!" He sat there just as cool as can be until turned him around and nudged him/her? and flew back into the pen. Before I left I noticed a couple others flapping and looking up like they were trying to figure out how to do it... luckily my brother has a big stash of screens with lightweight framing, so one long crossbar and 4 screens and the pen has an easily removable top. Boy do I need to get my coop finished.