Rodent skull (IMAGE) Florida Museum of Natural History Caption Humans have inhabited Hispaniola for roughly six thousand years, during which time the island's rodent diversity dwindled from 11 species to just 1. By determining exactly when these species last appear in the fossil record, authors of a new study pinpoint the historical events that led to their extinction. Credit Florida Museum photo by Kristen Grace Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.