I did post similar post when my bird was sick. But, now that I know she's ok and know what the problem was, I want to know how to prevent it again. My hen had a terribly sour, filled crop. It was full of yellow muck, undigested seeds, grassy stuff (could be try weeks, straw, or alfalfa, or dried wild natural grasses). In 7 days she only pooped out one finger size mass of rock hard fibrous stuff. On day 7, with lots of dropper feeding and love and support, she pooped again about another cup of the same hard fiber. What was that? Is it any of the grasses that I mentioned? How can I keep it from happening again? It hasn't happened to any of my other birds. Does this sound familiar. How can I keep her from eating whatever it was? It looked like the stringy stuff inside a baseball or a mass of elk or deer hair. I couldn't break it by pulling it apart. Ideas??