Doug Cavener, Penn State (image) Penn State Share Print E-Mail Caption This is research author Doug Cavener with an adult male Masai giraffe at the Nashville Zoo, Nashville, TN, USA. Credit Doug Cavener Usage Restrictions The image credit must be published along with the image. Share Print E-Mail 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.