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Here we go. It's an albino pygmy marmoset: http://www.canada.com/vancouversun/news/story.html?id=b4878e57-eb2c-43ab-ab0d-4101494c1a3d
I did a Google News search for "tiny monkey thumb", et voila! :-) Once I found out what they were, I did another search for "albino pygmy marmoset" and found more articles + pictures...