I have domestic and vulturine guineas and I clip the wings of the domestic guinea fowl (the vulturine are kept in a covered pen) with no problems. While it is true they can still fly, they don't fly as well and if there is ever danger they can get out of the way. I put all of my animals inside a barn at night because I live in the foothills of the Sierra Nevada mountains near Lake Tahoe and there are foxes, bobcats, coyotes, mountain lions and I just had a bear come through the property on Monday so it is important that during the daylight when they free range they can get out of the way of any predators who might come by but it keeps them from getting out of the yard. I clip the wings a couple of times a year, usually when they start getting up onto the roof of the house or barn it is time to clip them again!