We bought this 5 acre hobby farm, with a 1 acre fenced paddock. It had a hen house, which I cleaned and remodeled with at 15x22 pen attached and a barn. We decided we needed some 'pasture' pets. First we got 2 Pekin ducks.
After a lot of research I wanted an India Blue so I put a screen over the top of the pen. I found a 2 yr old male in our area for $75. The breeder told me that some of their peahens were better brooders than others, so they now routinely pull half the eggs and put them under Silkie brooder hens. The result is that 'Buddy' was hatched and raised by chickens and thinks he is a chicken.
I admit I clipped his primary wing feathers only. Being a parrot owner for years I knew he could still fly but not get much lift. He ignored the ducks and tried 3 times to fly out, gave up, and continued to look for a hole in the fencing.
The next day we got a 3 chickens. As soon as he heard their clucking he immediately stopped pacing the fence. The hens were inspecting the hen house and were up on the perches. Buddy stuck his head in small chicken door and walked into the house. The hens went nuts. No doubt the biggest rooster they had ever seen and thought they were to be mated with Andre the Giant. I attached a high perch in the corner for Buddy. He jumped up on it and they all settled down in their own space. He even slept in the hen house.
I kept all the new critters penned up for at least 2 weeks maybe longer. They free range the paddock all day and go in at night. For a week or so we had to herd them in, now they go in on their own at dusk.
We have since gotten an 2 yr old IB hen from a different breeder so their DNA is different, for $150. Used the same routine with her. I thought the expense was necessary to give Buddy a reason to hang around and so far it has worked. We also have two Pygmy goat kids. They all get along fine.
After a few weeks, Buddy started flying up on the pen roof. I shooed him down a few times and gave up. He sleeps in the large Cedar tree next to pen. The next morning he is in the paddock with the others.
I guess the moral of this long story is that A. You must have a ceiling of some kind over the pen. B. You must pen them up until they know where home and food is.
I think Peafowl are the Asian version of our wild Turkey. They are browsers and most always foraging and fly up high at night. They even walk and display alike.