This shredder toy is every bird’s dream! Loofah, cardboard, and crinkle paper provide awesome foraging opportunities… so many places to hide treats! We literally cannot hang this fast enough – the birds want to attack it immediately! But wait, does cardboard use glue? Is it safe and natural? The liner board and fluting that our cardboard is made of is glued together using a starch-based adhesive, such as potatoes, corn, sugarcane, and wheat. 9″ wide x 10″ long x 2″ deep. As seen on BirdTricks!