Margaret, Its best to just google it, casportpony You may be right. But with the main symptom being yellow poop associated with it whether a carrier or dying bird its one problem not too hard to figure out. Also as your pics show(Thanks for posting those BTW. they illustrate the liver perfect for your diagnosis) Its not like you have to be a vet and grab the microscope and try to figure out the other 100 things it could have been. Bam! liver spots.Unless hes an old bird like me. Sorry I couldnt help injecting a joke here. I only had one bird (Impeyan) sent in for a necropsy. West nile was the culprit on that. Sorry for the loss. Edited to say PS You need to become a avian vet if youre not studying to be one already!