I have a standard polish pullet who has been looking a little down for the last few days. I've been keeping an eye on her. She had been spending more time on the roost than the others. Today she was also a bit fluffed and I know something is wrong. I picked her up and something? near her front had an awful, sourish smell. Her crop was full, but not overfilled or hard. Lumpy. No drainage or discharge. Still waiting for poo. I massaged the crop and broke up the contents. Feels like normal food. I turned her upside down and squeezed it but nothing came out. No water either -- I'm thinking she has not been drinking either. I can't really tell where the smell is coming from, but it is not the vent. No nasal drainage. Eyes look good. She looks perfect otherwise. I've been reading the crop problems vinegar etc. It's just not clear cut to me. I don't want to lose her to something else while I'm focused on her crop. None of the other birds are affected that I can tell. I'm going to make her drink some water and see how it goes. Only 2 symptoms: sour smell and puffed up perching. Thanks gang!