Finally a treat cage made for smaller beaks! There is no "door" on this cage so whatever you put into it must be squeezed through the bars which just adds to the foraging fun! This one comes to you filled with shredded, crinkled paper but you can use just about anything when refilling ... coconut fiber, left over toy parts ... and since it's stainless steel, you can even put food into it (plus it's dishwasher safe).