Albino and Partial Albino

In the past 2 days we have discovered 2 color variant birds. One is a Sooty Tern chick which is a partial albino that is mostly white but has some color in the eyes and bare skin parts and a dark wash on it's feathers. The bottom picture, which shows the partial albino Sooty Tern chick has a normal colored chick in the bottom right to give a good color comparison. The black and white bird in the upper left in the same photo, is an adult Sooty Tern. The true albino is a Brown Noddy chick and the picture shows it with the adult Brown Noddy.