You can stuff the Holeykamoly with greens, root veggies, leafing branches, edible flowers, nuts, Popsicle sticks, twigs, paper, fibers or anything your bird would like to eat or play with. It's a great way to get your bird to begin foraging. The Holeykamoly is excellent as a holder or as a toy when empty. If the perch is small the ball will easily roll around and be played with. It can be used as a ball with an interesting thing or two inside. Your bird can carry it around, roll it on the floor and work their toes to reach inside in order to grasp the treasure within. The Holeykamoly varies in size because it is a real coconut. Approximately 6-8 inches in diameter.