Hey, all! This morning, I checked my chicks crops right after I took the cover off the cage (this cover doesn't let any light in). Only the youngest out of the 5 had an empty crop. The others all had some black stuff at the bottom of their crop. My first thought was yeast, but from hat I'm looking at, yeast normally shows through as white. Is this correct? And this was most definitely black. My next thought was an overstretched crop. However, most of the pictures I can find of overstretched crops are very severe. Can anyone provide me with pictures of a mildly overstretched crop? Another possible problem is that they are getting chilled. I haven't been home much over the past few days, but from what I've seen, the parents seem to have lost interest in warming the chicks. They just seem to feed them. Now, there are 5 of them always huddled together and they never seem cold when I pick them up, but I thought I'd still bring it up in case it was of any help. Thank you!