I've had ravens steal 2 of my half grown cornishX meat birds last summer. I sent one of my weimaraners to retrieve/take it away from the raven so I'd definately be careful once you put your birds outside. Ravens are smart and I let the ones around my pens and at my cabin know they are NOT welcome. The parents teach their young ones once they are flying that my cabin is off limits to their young but they still sit on the neighbor's cabin roof and talk about me, like family story time
I agree with them and remind them, too! The full grown ones can sound like a person thumping around on a roof very loudly! We have a ton of them here.
