According to the Alabama Comprehensive Wildlife Conservation Strategy, Alabama surpasses all eastern states in plant and animal diversity, ranking fifth in the nation after California, Texas, Arizona, and New Mexico. Alabama ranks first in the nation in freshwater species diversity, including more than 750 species of freshwater fishes, mussels, aquatic snails, and crayfishes. Unfortunately, no state east of the Colorado has more wildlife species at risk than Alabama. Only Hawaii, California, and Nevada have more imperiled species, and only Hawaii has lost more species to extinction.