Crab March (image) Princeton University Caption Each year, millions of Christmas Island red crabs make a two-week journey to the coast to mate. Climate change could be a special challenge to species such as Christmas Island red crabs or sea turtles that migrate to specific locations to reproduce. These animals do not live and breed in the same ecosystem, so any obstacle between one location and the other threatens their survival as a species. If they don't migrate, they can't reproduce. Credit Allison Shaw, Department of Ecology and Evolutionary Biology Usage Restrictions None 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.