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Scarlet Macaw Descriptive Facts. The Scarlet Macaw has beautiful bright colors of green, yellow, blue and red. This helps them to blend into their natural habitat in the rainforest. Weighing about 2.2 pounds (1 kilogram), the Scarlet Macaw, with a wingspan of over 3 feet (1 meter) is the largest parrot in the world. The reason I picked this animal was because is the most beautiful Bird I ever saw in my life.