SACRAMENTO - A conservative legal group has threatened to sue the federal government over its plans to protect four dozen endangered species in California ranging from peninsular bighorn sheep to the tiny robust spineflower. The Pacific Legal Foundation notified the U.S. Fish and Wildlife Service and National Marine Fisheries Service on Monday that it would file suit in 60 days, claiming the agencies failed to meet requirements of the Endangered Species Act when they set out to protect 16 animal and 32 plant species. Advance notice is required before filing endangered species lawsuits. Based on a favorable ruling in U.S....