SWEET! A leucistic nashville huh? I have seen a few yellows with small white patches, a crow that looked like a jackdaw, a 1/2 white robin, a very light cream colored merlin and TV(very cool!) and even a darkeyed junco that was leucistic. I would trade any two to see your bird up close!!!

My closest 2 might be the mourning X common yellowthroat I took bad images of(only the second EVER discribed) and the magnolia X parula(originally thought to be a sutton's warbler which is parulaXyellowthroated warbler) I never could get an image of, but got plenty of looks at.