Lange's Metalmark Butterfly

From USFWS National Wildlife Refuge System:

There is only one place on Earth where the endangered Lange’s metalmark butterfly lives: sand dune habitat along California’s San Joaquin River, mostly within Antioch Dunes National Wildlife Refuge (http://bit.ly/2cfoJNQ). The refuge is not open to unsupervised public use because of the sensitivity of the habitat and the endangered species. Photo by Steve Martarano / U.S. Fish and Wildlife Service