Parrots are a rainbow of colors. Take the Scarlet Macaw for example, with its combination of red, yellow, blue, and a hint of green! Color and vision are important to birds- it can help in mate selection, finding food, and even assessing ripeness of fruits. It is no wonder that bird toys, and even foods and pelleted diets are offered with so many bright colors.
While a human can see the visible spectrum that ranges from about 390 to 700 nm, a parrot can see those colors plus the ultraviolet light range below 400 nm.