This Chris. Some migrate, some don't. This one does not. I've taken many pictures of him over the last few years and he winters at a small urban lake. The "gray" feathers are actually white, and thats the way ther are (not molting). I should have made a correction in PP to make them whiter. In a few months the area around the eye will become turqoise blue, and the white feathers more of a brown.This happens quite a bit earlier in the year in Florida than Texas.
With this specific bird I have developed a considerable degree of trust over the years, and I can get within minimum focus distance if I move slowly. This was not always the case. Regards~Bill