Chinstrap and Adelie Penguins Leuchistic Forms
Some species are prone to producing occasional individuals like this, known as "leuchistic" forms. Not albinos as they do have pigment, but not as much as the more normal members of the species. These penguins would always hang around the breeding grounds with others of their species, though I never saw one that had any success in breeding - incubating eggs, building a nest etc. Maybe they were just a little too different for the other penguins.
Photo copyright - Paul Ward / coolantarctica.com