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Jaw bone comparison
This photograph shows the size difference in the jawbones of two 60-million-year-old crocodile ancestors found in northeastern Colombia by University of Florida researchers. Acherontisuchus guajiraensis, top, is described in a study published Sept. 15 in Palaeontology. The other specimen, Cerrejonisuchus improcerus, was the first ancient crocodyliform found in the Cerrejon open-pit coal mine. The new species is the first known land animal from the Paleocene New World tropics specialized for eating fish, meaning it competed for food with Titanoboa, the world’s largest snake. Photo taken Sept. 1, 2011.

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