Hahn's mini macaws, Ara nobilis nobilis, also known as Red Shouldered macaws, are the smallest of the miniature macaws. They are predominately deep forest green with dark teal on the top of their heads above their beaks, and crimson red at the bends of their wings on mature birds. They have white patches of skin around their eyes with small black feathers that trace patterns on their white facial skin.

Hahn's mini macaws are about 12 inches in length, half of that being their long tail, and weigh around 165 grams.

Hahn's miniature macaws may be small in size but they are large in personality. Hahn's macaws are endearing and acrobatic. Their favourite position is hanging by one toe while playing with a toy, or from your fingers. Extremely playful and exuberant, Hahn's mini macaws seem to smile all the time. They adore toys and readily accept new ones. They also seem to love things to snuggle with or to hide in while sleeping.

Hahn's macaws can often be quite good talkers, picking up many words and phrases as well as caricature laughter. Their voices tend to be higher pitched and are sometimes a little bit difficult to understand if you don't know what to listen for. Hahn's can also have a harsh, loud call, but they only use it when they really are distressed or trying to make contact with their flock (family). Their contact calls can be a bit piercing. Fortunately, they tend not to be screamers unless they are isolated from their flock. They will contact call often when their flock is out of sight, so it is important to keep Hahn's macaws in the mainstream of the household so they feel safe and secure while their flock (family) is doing things.

These little green guys are not as socially demanding as the bigger macaws, and overall seem to be more independent. However, it is very important to spend regular good-quality time with your Hahn's mini macaw or it can become very wild. They are still macaws, and require as much interaction as a large macaw to keep them tame.