I thought it was going to be the eggs.. but I was wrong. The best and actually the most economical part about owning our birds is that I NEVER have to throw away food anymore.. With our children grown and gone, I would increasingly have to throw away bread before we were done with it - or fruit that had ripened beyond our liking.. etc. Now that never happens and as silly as it sounds it makes me feel so good not to be wasting any thing ! Okay - that is all .. just had to share that!!!