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July 30, 2012
A crocodile. Mammals and many species of birds and fish are among "evolution's winners," while crocodiles, alligators and a reptile cousin of snakes and lizards, known as the tuatara, are among its losers, according to research by Michael Alfaro, a University of California, Los Angeles, (UCLA) assistant professor of ecology and evolutionary biology. Credit: Michael Alfaro, UCLA Biology Department

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