If you thought that crocodiles were menacing enough, be glad that you didn’t live in Arizona some 225–201 million years ago—when their ancient ancestors strode around on two legs. Paleontologists from the University of Washington and Seattle’s Burke Museum of Natural History and Culture report the discovery of a new species of "shuvosaurid" reptile that lived in what is today the Petrified Forest National Park, known for its large deposits of fossil wood. Members of the shuvosauridrae bear a