Hello! I have a sick one year old Lavender Roo, his crop seems to have more air or gas in it than food. He keeps shaking his head and doing something that resembles burping or hiccuping (he got frostbitten on his wattles over the winter, and he shook his head a lot because of that, could it still be bothering him maybe? It looks healed up to me) . He did throw up some foam when I picked him up earlier as well. He has some almost green diarrhea (I figured this might be because he ate some grass in his run) We had another lavender roo in a small coop with him up until today when the other room died. We're not sure what happened to him, be didn't have anything in his crop when I checked just after he passed. Does anyone happen to have any ideas what the soft/airy crop could be? We have 5 other chickens in another coop outside and they all have soft crops, but they don't seem to be as full of air. Any information would be helpful. Thank you in advance!