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A very long and detailed post on parrot poopology or bird droppings. Why is it important to examine your bird's droppings and what signs to look out for.
It does not look a green as it should when liver disease is present. Looks more like some color has leeched from the feces. That said, how long has it been since he has had blood work done (CBC and Chem Panel). Greys are in the top tier of birds susceptible to liver disease.