The Buffon’s Macaw is the larger cousin of the Military Macaw, and they definitely look related! In fact, they could pass for twins. The only noticeable difference between a Military Macaw and a Buffon’s Macaw is the size. Buffon’s Macaws are significantly larger than Military Macaws. They are dwarfed by none and can hold their own with a Hyacinth Macaw – the largest Macaw in the world. They are entirely green, with the exception of the red feathers on their forehead, and the blue flight feathers of their wings. The underside of their tail also has blue and red feathers in it.