midnight- I have seen pens where fowl were trapped and mutilated by predators, being in a tree is much safer. I live in a rural area with no cars and I don't breed them for profit, so they just live a natural life except that I feed them extremely well. some years, I lose 1 or 2 to old age or some other illness or injury, it's hard to say what happened.
Peas are bug eaters and without that as a food source, they need lots of protein and greens. I wouldn't have them if I couldn't let them roam. Trying to make them into pen birds is sort of like the whales at Seaworld. And I disagree that hatchlings are a good investment. I've tried to raise babies whose mother was killed and they all died and they were older. Without those skills the mother teaches, they can't fend for themselves and they get cold. They are very fragile also to injury. One orphan that I raised in a pen was so unhappy, he injured his head, banging on the cage. When I let him outside, due to the banging, he seemed to be fine, but after a 3 day rain, he got too cold and died. They need a full set of feathers to be able to survive weather. I think they are much fun to have and perfect pets, but chances are, if you don't have enough property, it's a mistake. Your neighbors will hate you for the screaming and possible roaming and the birds will be miserable locked away. When I lived in the city, I had neighbors complain about my small parrot, it's just life today. Some people have nothing better to do than complain. We've got 50 acres, so they don't generally go that far away from the food source.