Up until now our girls have stayed on the ground. They have a large lower yard to free range and though they occasionally have gotten on top of the Eglu run, they haven't got in the tree or over the fence or anything. The run is only 2 feet off the ground. Well, last night I was sitting on the deck reading my Country Living when Mabel, my Delaware, went from the top of the run (2' high) all the way on to the deck railing (10' high). I was shocked. She looked at me for a few seconds (she's not laying yet, so the least friendly) and then jumped down, gliding to the ground fairly gracefully. Holy heck! Guess some chickens have better flight genes than others.