I have a 5 week old chick that has a gigantic crop - It's not a hard mass, it's very squishy and mobile. I was putting cut up towels in their brooder for bedding and washing them, and now that she has this issue, after reading about causes, I'm wondering if maybe she ingested a loose towel string or something... She does not seem to be in pain, is active and eats well - but her crop is huge. HUGE. And it feels really quite gross - like a water balloon. Help?