This aberrant Royal Penguin, above, lacked any black, being a milky-coffee colour. Odd, yet it was accepted by its kind, it can be called amelanistic (without melanin, the dark pigment), or to be precise, it is melanic-schizochroistic, where there is a loss of the eumelanins (the dark browns or blacks), which results in the ‘fawn’ colour.
The King Penguin, left, is (partial) leucistic.
The Adelie below would seem to be partial albino as the bill, which should be reddish-black, is white with red tip.