My Blue and gold macaw is losing fur on its stomach is this usual?

Fur? If your macaw is losing LOTS of feathers, take him/her to the vet for an exam. On another note: Birds moult- While plumage may look thin or uneven during moult, the general shape is maintained despite the loss of apparently many feathers; genuine bald spots are typically signs of unrelated illnesses, such as injuries, parasites, or feather plucking. If the feathers are missing in a patch and no other feathers are missing- he/she should be seen by the vet.