Susan Gonzalez sent in this photo to see if she could get an identification. Ron LeValley identified it as a partially leucistic American Robin.

You can see it's not a true albino as its eyes are normal color. Still it is a very unusual bird.

Thanks to Susan for allowing me to share this photo with you here. To see two other partially leucistic birds, here's the link: http://www.mendonomasightings.com/2012/09/05/two-strangely-colored-jays/