Here's a good discussion covering the technicalities of the two:
http://www.birdforum.net/showthread.php?p=381615

<http://www.birdforum.net/showthread.php?p=381615>Basically, to be
completely accurate it is either completely lacking pigmentation (albino) or
partly lacking pigmentation (leucistic), but people know what you mean if
you call an animal "partially albino" even if it is not a technically
correct term.

Thomas Knight


On Fri, Apr 15, 2011 at 9:58 PM, Barry Ulman <ubarry at qwest.net> wrote:

> Hi Tweets,
>
> For the last several years or more, I have seen people (including
> myself) refer to birds with abnormal white patches in their plumage as
> "leucistic". In the past it seems that such birds were called "partial
> albino". Are leucistic birds the same as partial albino birds, or are we
> talking about a whole different phenomenon?
>
> Barry Ulman
> Bellingham, WA._______________________________________________
> Tweeters mailing list
> Tweeters at u.washington.edu
> http://mailman1.u.washington.edu/mailman/listinfo/tweeters
>
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