I got her two years ago with the problem. She is now living with a flexible collar and does very well (her personality is actually more normal with the collar on than when she has it off and is preoccupied with picking). Just curious if anyone has any further ideas. She’s got a clean bill of health from the vet, a new diet, and the largest parrot cage on the market filled with toys. I’ve tried different cage locations and increased frequency of her baths (she hates spray bottles). I haven’t yet tried her with another cockatoo because I’m afraid she might hurt it since she hates my other birds. Thoughts?