Wild parrots like to descend on a tree full of ripe fruit, take one bite from a piece and hop to the next piece of fruit, like those cartoons you see of ladies taking one bite from each chocolate in a large box, never eating a whole candy but ruining the box for everyone else. At home, there's nothing Peaches and Pita like more than to take one bite out of a chunk of apple and fling the rest to the floor.
Hang the apple in the cage and here's the result. Yes, half the apple fell to the bottom of the cage but the birds had a good, messy time.