My friend's grey 1st flew out of the house when he just learned how to fly. They got him back from the roof of their neighbor's house and the grey was clipped immediately. A year later without realizing the feathers had grown back, their grey escaped again and was found in a neighbor's house 2 days later. Again the grey was punished for the owners' negligence. His wings were clipped for the 2nd time. After a month, the grey found his way out of the house again and had since gone for more than a month. The owners saw their grey escaped right under their nose. Even with wing clipping, their grey was still able to fly away.