I would suggest feeding, taming, and keeping the peacock. Since it is already used to freeranging and surviving on its own - just put out some food for it. Peacocks are not only beautiful, they are GREAT livestock guard dogs, well LGB "livestock guard birds". I have six and though they are still young at almost one year, they freerange with our 200+ chickens, chicks, ducks and ducklings and they sleep way up in the highest trees. They stalk any new dog or cat we get just to be sure it's not going to hurt the flock and they sound the alarm if something amiss is going on. They even seem to break up rooster fiights and don't like the chickens getting too carried away.
Once the peacock calls your place "home" and your flock his own, he will be a great protector. Until then, yeah, he might get a baby chick or duckling so keep them locked up till then.
By the way, best I can tell, they aren't like chickens who can't see in the dark and can be easily picked off their roost - so before you try and grab a grown wild peacock, be warned, they bite and have sharp claws and are very strong and....well, let's just say mine are tame, hand raised, hand fed, and I wouldn't want to make one mad.
