Pigeons do not have a gall bladder. Bile drains directly through the right hepatic duct into the duodenum. If this duct gets blocked and then becomes dilated, it may resemble a gall bladder on ultrasound or at postmortem examination. This chapter considers hepatic disease; renal disease; endocrine disease; cardiovascular disease; eye disease; neurological disease; reproductive and paediatric disease; oncology; poisoning; and feather disease.