In this image released on Wednesday, Jan. 16, 2008 by the Royal Society, an artist's illustration is seen of the head of a Josephoartigasia monesi, a newly discovered extinct species of rodent, compared to a large living rodent, a Pakarana. Uruguayan scientists say they have unearthed fossil evidence of a giant new species of rodent, by far the largest ever discovered. The exceptionally well-preserved skull is about 4 million years old, and the scientists say it shows that South America was once home to a frightening variety of mouse which could grow bigger than modern-day bulls. (AP Photo/Royal Society)

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