Dr. Friedrich Janeczek was asked to respond to the recent discussion on the Exotic DVM forum where the occurrence of black feathers was showing up on a green bird. Dr Janeczek has one of the only all parrot veterinary practices in the world.
His comment is that while on Harrison’s a bird’s feathers remain the normal bright vibrant colors and elasticity for up to three years.
Whereas a bird on seeds, vegetables and table foods has liver disease and it is reflected in the black feather color and loss of proper structure.