The Center for Biological Diversity today filed a notice of intent to sue the U.S. Fish and Wildlife Service over its lengthy delay in deciding whether to extend Endangered Species Act protection to the foothill yellow-legged frog, which has disappeared from more than half its historical streams in California and Oregon. These stream-dwelling amphibians face a host of threats, including dams and water diversions, logging, mining, livestock grazing, roads, marijuana cultivation, off-road vehicles, climate change, pollution, invasive species and disease.