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Dinosaur Mammal Divid_Hass.jpg

A shrew-sized Cretaceous-age animal, Ukhaatherium nessovi, is one of the many mammals used in a mammal tree-of-life study released Thursday, Feb. 7, 2013. The fossil was discovered in 1994 in the Gobi Desert by the Mongolian Academy and the American Museum of Natural History. A team led by Maureen O'Leary of Stony Brook University looked at 4,541 different characteristics of mammals still around and extinct and traced their DNA and their physical features back until it seemed there was a common - and hypothetical - ancestor. They never named the hypothetical creature, not even nicknamed it, but they had an expert draw it based on the features they're pretty sure it had. (AP Photo/American Museum of Natural History, S. Goldberg, M. Novacek)