Ara is a blue and gold macaw, and as you can see her neck is a bit off. Her neck vertebrae are fused incorrectly, causing her head to be permanently stuck 'upside-down'. Despite this handicap, she is vibrant, loving bird. She can twist her head up into 'normal' position for stretches of time, and she is active and has done very well adapting to normal parrot activities.
If you're interested in learning more about macaws, or keeping parrots in general, here are some books I recommend: