Leopard tortoise (Stigmochelys pardalis). (IMAGE) Species360 Caption New study shows that certain species exhibit slower aging, or none at all, when living conditions are favorable. Photo: Leopard tortoise (Stigmochelys pardalis). Credit: Canva/Getty Images. Credit Getty Images/Canva. Usage Restrictions None License Licensed content 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.