Giant South American River Turtle Adult (image) Wildlife Conservation Society Caption This is an adult Giant South American river turtle. The turtle is the largest member of the side-necked turtle family and grows up to nearly three feet in length. Credit Photo credit: C. Ferrara/Wildlife Conservation Society Usage Restrictions One-time usage only. 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.