When I see a flash of blue in the yard, I just assume it is a bluebird but yesterday the blue was from an Indigo Bunting instead. It was the first I had seen them this year but since they migrate at night using the stars for guidance, they probably couldn’t arrive earlier with all the snowy nights.
Like all other blue birds, Indigo Buntings lack blue pigment. Their jewel-like color comes instead from microscopic structures in the feathers that refract and reflect blue light, much like the airborne particles that cause the sky to look blue.
Indigo Bunting