Me and my wife are bird lovers. In South America she grew up having macaws, toucans, falcons, monkeys, etc as pets.
Any way she just bought a 6 week old conure which is a small green bird with a grayish under belly about the size of a cockatiel. In two days she has this bird potty trained.
All she has to do is say "poop" to the bird and he drops a bomb. Everytime. She puts it on paper, or on the ground and says "poop" and step back. Amazing. Good thing they go to bathroom every 20-30 minutes.