In some species, such as macaws, the gastrointestinal symptoms show up first and it takes a while for neurological symptoms to arise. In cockatoos, you see the neurological signs first.
[header] How to treat macaw wasting disease [title] Recognize gastrointestinal and neurological symptoms of pdd. [step] Macaw wasting disease or proventicular dilatation disease (pdd) can be recognized by a range of digestive and nervous system malfunctions. Your bird may start regurgitating food or simply look very depressed.