Chikoman,
I've raised chukars since 1967 and I really like the birds. They do act differently than pheasants and most quail. First, I see you live in Utah. I lived there myself many years ago (around SLC). The soil there is arid and sandy. This is great for chukars. If your soil is the same you can keep them on the ground there without worrying about picking up ground born disease and parasites. Chukars cannot survive very long on topsoil in wet humid climates (like were I live here in Tennessee) Remember where they come from North Africa, Iran and Iraqi etc... I keep mine on the ground here by building up chert pads above the topsoil and keeping them in "houses" with a metal roof and floors made of rock and sand so they are dry all the time. I don't use very large pens they are 4' by 10' and about 9' high. The reason for the 9' height is that in nature chukars like a high perch to keep watch. I have 2x4 toprails to their pens and they love to walk around surveying their surroundings. I've found over the years that they do better if they are on the ground where they have rocks and sand to dig in and a nice dirtbox for dust baths. I've about eliminated aggression this way. Notice I've said "about." as someone else said they had one that became aggressive and pecked a lot. I can almost guarantee this will happen to you. When I see this happening, I put a flexible peeper on the bird at once and leave it for at least a month. This changes the pecking order in the flock and usually stops it. As far as sexing the best way is to really watch the birds and learn their behavior. Males do act differently than females. Someone else mentioned about spurs. Well sometimes it works, but I have a bird with nice big spurs and she lays nice big eggs as well. Sorry, there is no absolute way to sex chukars by physical appearance. Everyone has their own method of sexing, but, until I see the birds mating or laying eggs I make no promises to anyone. My wife even says she can sex them by their beak length. Do keep them away from chickens, turkeys, pea fowl etc as they will pick up disease much quicker than pheasants or quail. Feed them a good quaility, high protein poultry feed and they will do well and live for many years. Some of the pluses to raising chukars are: interesting behavior and nice calls, easy to raise and eat very little food, can handle temp ranges from 120 degrees above to -40 as long as they have shelter from the wind, very prolific and will go broody and hatch their own chicks if given the right conditions and last they taste great! I hope you give it a try.