Pushing on in years, the 35-year-old bird lives in Florida, with Cherie Wachter, at the Humane Society of Broward County.
\"She has become part of the family and is very particular about who she becomes friends with,\" said Ms Wachter.
\"Of course when people first see her when they walk in they are taken aback, but they soon realise that despite her appearance she is quite a happy bird.\"
Oscar was taken in by the Fort Lauderdale, Florida, centre 13 years ago after she was recovered during a local drugs raid.
However, it quickly became apparent that she was suffering from a condition that affects birds called Beacon Feather.
\"Her disease caused her immune system to become repressed,\" said Ms Wachter.
\"It is contagious and therefore she can't be around other birds.
\"Another side-affect is that she plucks her own feathers because they irritate her so much.