swollen underside

I have a young pigeon that is holding his tail down and breathing heavily. His abdomen is swollen, I'm thinking the swelling may be swollen air sacs. But I also wonder if other internal swelling could be pressing on the lungs and affecting his breathing, He does not seem to be pooping much but I...

I have a 13 year old ring-neck dove. Lately she has been acting strange. She sits a lot more than she ever has before and she is not as active as usual. She has a clear bubble on her underside near her bottom, it is as big as an egg but it is soft...:confused: I am wondering if it might be an...