Image 2 (IMAGE) Florida Museum of Natural History Caption North (left) and South (right) American porcupines have been on separate evolutionary trajectories for as long as 10 million years. Credit Florida Museum photo by Kristen Grace Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.