Blue Mutation Macaws are mutations of Blue-and-Gold-Macaws. Where a Blue-and-Gold Macaw would have yellow feathers, they have white. They have black neck feathers and a black beak and gray feet. Everwhere else on them is a rich blue. The undersides of the wing and tail may have a pale gray wash. They are rare, but not a species. They are simply a color mutation of the Blue-and-Gold.