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After
having attempted to view the first photo and having to sign on to Flickr (which
I have no wish to do), nothing showed, except photos by other people that I
don't know and am not interested in. The second link showed a normal Red-browed Finch. So I can't see what you are
referring to. To answer your question. Yes all adult Red-browed Finches have a black stripe down the top of their
beak (but no other finch species does, as far as
I know). So if there
is white on the top of its beak, then if it is
not poo (i.e. uric acid) or a trick of light reflection, it is probably a
genetic defect.
Philip
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