Snowdrop the penguin
You'd think albino penguins would be more common since they spend so much time in the snow. (If you're going to be an all-white animal, what better backdrop could you find?) Of course, nature doesn't work that way.
Snowdrop the penguin was one of the few albinos that made it to adulthood. He was born at the Bristol Zoo in England, and was accepted by his clutchmates unconditionally.
Sadly, Snowdrop only lived for a couple of years before dying suddenly in August 2004.