Elfin Woods Warbler (IMAGE) USDA Forest Service ‑ Southern Research Station Caption The Federally Threatened Elfin Woods Warbler occurs only in Puerto Rico's mountains. Cloud forests dominate its range. Credit Photo by Gloria Archilla. 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.