Last week I lost one of my Indian Ringnecks suddenly; I was in the aviary feeding the birds when I noticed "Turk" climbing the side of the aviary and vomiting. I captured "Turk" and brought him inside to be monitored, we found missing feathers on top of his head and wound on his wing. He later passed away that night... My two theories of what happened for a otherwise healthy bird to die suddenly is - 1. Attacked by one of the other two Indian Ringnecks in the same section of the aviary. My wife witnessed my Creamino female "Milly" on top of "Turk". 2. Attacked from our Grey Goshawk that we see every second day or so. After "Turks" death we have witness it trying to bite through the aviary. My theory is that it somehow got a hold of "Turk" and caused him his injuries.