He's 13 months old. He generally holds his leg at that angle in the photos I posted when sitting or swimming, but when he tries to walk he'll extend it a little more to touch the ground. I haven't seen him extend it like the chicks in those pictures.
Miss Lydia, my best guess would be over activity, because I'd seen him literally running top speed after the girls many times. Like I said before, the only other thing I can think of would be the ramp going into the pen, and they don't really go on there until it's bedtime, so that seems unlikely to me.