This cockatoo is not in a good shape... Which species is it btw? Feather plucking shouldn't appear when a natural habitat and partners are provided. So maybe this is a donated pet from ignorant owners.
Looks like a Salmon-crested/Moluccan. An extreme case of feather-plucking so presumably from a very bad environment and obviously hand-tame-old habits die hard even under improved conditions. So many'pet' parrots live such unnatural lives and feather-plucking indicates the stress they experience.
I should have added a comment to this photo when I posted it. It's a donated or rehab case bird as a lot of Tropical Birdland's birds are. In its previous home it feather-plucked so much it damaged the follicles, so it will never grow back feathers. However it's now a very happy bird.