I enjoy watching them & they are peaceful in groups. I started with few pair & just kept adding to them. I kept my pigeons in with my chickens and peafowl for the last few years. This worked out fine with the adults, HOWEVER, chickens and especially peafowl will kill the young if they get a chance.
I love my peafowl but they are brutal on chicks. They are the first to notice anything new in the area and will harass it. I've never had them kill or injure an adult chicken or pigeon but their beaks pack a powerful punch that a young bird can't withstand.
I finally got my pigeon coop and run set up this spring and the pigeons are hatching out squab like crazy. I do have 2 silkie roos hanging out with the pigeons and they don't touch the babies at all even though there are a few pair that decided to nest on the floor of the coop.