There was also a paper by Hein van Grouw in British Birds (Jan 2013) - see e.g.
http://www.researchgate.net/publication ... s_in_birdsThis gives more detail on the chemistry and genetics behind colour aberrations. It points out, amongst other things, that true albinos which lack all melanin rarely survive long in the wild but that a different aberration called ino, which involves melanins being present but failing to produce pigmentation, also results in birds with near-white plumage and reddish eyes but with better eyesight than an albino and capable of better survival.
None of this will stop people referring to any bird with a bit of unexpected white in its plumage as an albino, as a Google search for e.g. albino swallow or albino blackbird will confirm.