White Bird at the Feeder

This white bird has been coming to our neighborhood feeders on Daisy Bay since at least the end of December. It is very quick, and usually spends only about 3 seconds grabbing a sunflower seed, then retreats to the shelter of a nearby tree. We think it might be a white phase of a chickadee due to its size and behavior. Since there is some color on the wings, and black eyes I don't think it is an albino. Has anyone else seen similar birds in the area?