Pink-tailed squirrel

I've been trying for weeks to get a good photo of this dude. He is one of six or eight resident grey squirrels that nibble and tussle under our bird feeders. Note that I said "grey" squirrels. They are all uniformly grey--no fox squirrels anywhere around. I suspect that one of his parents is an albino squirrel that shows up from time to time. In certain light and when he has his tail bushed out, it's very pink--you can see both red and white hairs in it. I wonder if this is as unusual as I think it is. He seems to be as frisky and healthy as the others.