Don't want to derail the albino animal thread but since melanism is the opposite side of the same coin...
I'd just like to point out that there's no such thing as a "black squirrel," they are actually melanistic Eastern Grey Squirrels, Sciurus carolinensis. In other words, squirrels that appear grey can mate with those that appear black and produce viable offspring.
The lack of pigments is albinism, the production of too much is melanism...they are direct opposites and have similar heritability.
Phil
BTW, don't say "grey squirrel" to anyone from the UK...
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