Cuatro Ciénegas Poza (IMAGE) Rice University Caption The spring-fed pools, or "pozas," in Mexico's remote Cuatro Ciénegas valley are home to at least 70 species found nowhere else on Earth. Credit Tommy LaVergne/Rice University Usage Restrictions must credit: 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.