My tiel just loves the plastic ring off of gallon milk jugs. Make sure
you cut the ring before you give it to the bird and watch them while the
play. Milo takes the ring in his beak and flips it up over his head. He
then has to figure out how to remove the pretty red thing from his neck.
The foot goes up and the beak starts to work and voila the ring comes
off. This game is repeated for at least and hour.