The Generation II Giant Foraging Wheel Bird Toy is a foraging device constructed to withstand the strongest beaks! This is a physical and mentally challenging toy that will keep your extra large bird busy for hours. This wheel mounts vertically on your bird cage and they will spin the wheel to release the treats. Extremely rugged construction for big, tough parrots. 2 in. deep X 8 in. diameter. Recommended for extra large birds.