Should birds be kept in cages?

I bought a pet peacock a few weeks ago. Boy, was THAT a mistake! Have you ever heard a peacock? Oh my God, it yowls and yowls. It is definitely not a pet for apartments, that's for sure. It wakes me up in the middle of the night by coming in and shaking me by the shoulder. "Wayne, wake up." "What's wrong?" I say, half asleep, and then it just walks away. Christ, I'm telling you, big mistake, that idea.