Extinction (image) Stanford University Share Print E-Mail Caption The Española Giant Tortoise (Chelonoidis hoodensis), a species endemic to the Galapagos island, is threatened by introduced species. Recent conservation efforts have increased the number of tortoises, but only about 200 remain. Credit Gerardo Ceballos Usage Restrictions Credit Gerardo Ceballos 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.