Measuring a Crocodile's Smile (video) University of Missouri-Columbia Loading video... Caption Crocodilians' skin on their faces is incredibly sensitive. A University of Missouri study is examining the size of those nerves to determine how this function has evolved over time. Credit Nathan Hurst/University of Missouri Usage Restrictions None 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.