I have 2 Australorp hens, almost a year old, and they are my dear favorites. I would be sick if something happened to them. They are so friendly, and curious, they garden with me, they are not afraid of anything, they come when they're called.... just fabulous birds. ANYHOW, on topic.... They don't fly much at all. I've seen them fly 4' high to reach a porch rail, once or twice, just for treats, but they have very little interest in my trees. They are more interested in the worms and bugs hiding under the stepping stones (that I MUST turn over for them at least every couple of days). I have a constant hawk threat in my yard, more so than any other predator. There are some giants that soar the skies above. I am home 5 days a week, and I make sure that all my birds get to come out for supervised foraging for a few hours. Its my excuse to do gardening or reading, or whatever, outside. I put both my big dogs out there in the yard, and my two daughters, and we just make time to watch the birds. They don't have a coop with a run. I have more of a chicken vault, to keep them safe, so I know they really need their foraging time. My fences are only 3'-4' tall, and they don't fly over them. Overall, they seem to be pretty happy birds, even though they aren't free ranging all day long, but rather just a few hours. They go back in their coop after a while, and get right in their nests. I get lots of nice eggs, and everybody gets along fabulously....almost. I have some younger pullets I'm trying to integrate slowly, and my "Christy" isn't too fond of them yet. I'll have to keep reading on tricks for integration. They free range together, without any serious incidents, but I'm not sure they'd take to being "cooped up" together yet.