Is this an adult? Only one? Have they been out on grass or anything?What do you all give for watery green diarrhea? They want 50 bucks for a fecal.
The first thing I always do for any digestive issues is give some plain yogurt or probiotics if you have them. Check the crop to see if it's hard or squishy or empty.
When it's raining, they can get watery poos if they are out in it. Is the green dark or very bright?