Man
Human are by far the largest predator of the macaw for many reasons. According to Animal Bytes, a website dedicated to animal information and discovery, humans hunt the macaw for their feathers and meat, and they smuggle their eggs and young to sell in the pet industry. Humans also deforest the macaw's habitat by cutting down trees and farming the land.
Eagles
Outside of human contact, the eagle is the main predator of the macaw in the wild. The harpy eagle preys on the macaw while in the treetops and while in flight. According to The Peregrine Fund, a nonprofit bird conservation, the harpy eagle's hunting ability makes hunting birds easy to accomplish because of it's precise swooping ability. The eagle zooms in to the prey and never loses sight of it. Very rarely does it lose its prey.
Snakes
Macaws do not do well on the ground, and they do not land on the ground unless they are in large groups of 30 or more. Snakes such as the boa constrictor and anaconda prey on macaws such as the blue and golden macaw. The snakes must work quickly to take down its prey since the macaw can just fly away. Luckily for the snake, the macaw is slow on it's feet.
Domesticated Pets
Other pets in the home, such as a dog or cat, pose a serious risk to macaws. If other domesticated pets are left unsupervised in the same room as your blue and gold macaw they can do serious damage to it. This is because macaws cannot tolerate a large blood loss. Birds do not carry a lot of blood in their body, and it can quickly become depleted, resulting in death. To prevent a death by another pet, your macaw should always be supervised closely.