Thunder Basin Grasslands Prairie Ecosystem Association, Douglas, Wyoming - Thunder Basin Grasslands Prairie Ecosystem Association Meet the Wildlife Meet the Wildlife Meet the Wildlife Meet the Wildlife Meet the Wildlife Focus Areas Share 2 Ecotypes 8 Covered Species Our conservation strategy focuses on 2 ecotypes and 8 species to maximize conservation benefit and to promote sustainable populations and habitats. Shortgrass species assemblage Sagebrush obligate assemblage Whats New Conservation Advisory Committee The Next Steps Search our Site Conservation Snapshot Our Mission Develop a responsible common sense sciencebased approach to landscape management within the five northeast Wyoming counties. Sage Grouse Strut Sage Grouse Strut Coverage Area The Thunder Basin Grasslands Prairie Ecosystem Association coverage area spans 13. 2 million acres in northeastern Wyoming and southeastern Montana.