Click here for a link to a video showing the bird (it’s in Portuguese, but you don’t need to speak the language to understand the meaning of the video).
On the Project FeederWatch site, you can find a nice explanation about plumage variations and the difference between albinism and leucism:
Albinism is a genetic mutation that prevents the production of melanin in the body. Leucism is a genetic mutation that prevents melanin from being deposited normally on feathers. Leucism is rare in birds, and albinism is extremely rare. From 2000-2006, Project FeederWatch participants reported fewer than 1000 leucistic birds. Given that participants report about 5.5 million birds each season, the percentage of leucistic birds is very, very small.
Typically birds with abnormally white feathers do not survive long because they are so much more visible to predators. Those that do survive may have trouble attracting a mate. Consequently, the mutated genes that cause albinism and leucism are less likely to be passed on to a new generation.