Blue quakers are the same species of parrot as the common green quaker. However, their genetics are slightly different, which is why they look blue to us. Selectively bred for choice coloration, blue quakers lack psittacin (or just have less of it, depending on how blue they are). Psittacin is the yellow pigment that, normally, blends with blue pigments and causes the quaker parrot to appear green. This doesn't affect the health of the bird or their personality - only their color. They look exactly like a green quaker, having all the same light and dark patches, but they're a beautiful blue instead! They are small parrots, measuring approximately 9 inches including the length of the tail.