been a long time since had it but your probably right behind Typical signs are puffy crop, slow crop, vomiting, sour smell from bird’s mouth, foamy diarrhoea. The most common yeast is called Candida albicans. That is the reason why yeast overgrowth in pigeons is called Candidiasis (Sour Crop is another name). Causes birds on antibiotics treatment and high sugar diet usually develop Candidiasis. Baytril is especially one of the drugs that stimulate yeast growing and it is recommended to administer together with Nystatin. Treatments below: Good treatment for Candida are Mycostatin, Amphotericin, Flucytosine etc. Emptying crop, flushing with diluted solution baking soda, or Lugol’s Iodine solution are good remedies in case of Candida infection. All antibiotics must be discontinued.