bird diapers DO exist, but birds generally don't like them. you CAN potty train birds by making up a potty word/phrase (ours is bombs away) and saying it when they look like they're gonna poop (requires spending a lot of time with them and knowing their signs). have millet or other treats handy for reinforcement. it takes a while, especially when the bird is a bit older, but it removes a lot of hassle! ...or you could put a dishtowel on your shoulder and have him stand on that.