Taking a species off the endangered species list or even the threatened list is always a big challenge. A lot of that always comes down to habitat. The habitat you see behind me is the only place where Lang's Metal Mark Butterfly is found in the wild. The service created the Antioch Dunes National Wildlife Refuge because the research from academic professors and and and other interested parties discovered that this is a very unique habitat and there was a very unique butterfly occupying this habitat along with two other with the the host plant for the the butterfly the naked stem buckwheat. There was also the contra cost of wallflower and Antioch Dunes evening primrose was a another endangered species found only in this remnant Dune environment. The only place on the planet where they're found. Antioch Dunes National Wildlife Refuge is divided up into two units so within the Sardis unit we're standing in what we call the pit an area that was excavated of all of its sand. Dunes reached up to about a hundred feet high right along the river's edge. The sand was in a especially pure material and it could be used to make bricks. After 1906 the great earthquake of the Bay Area the San Francisco earthquake. Bricks were needed to rebuild the city. The sand was so important that they had rail spurs coming off of the rail line in here just to load up the sand and load up the bricks and haul it away to be used elsewhere. US Fish and Wildlife Service started a restoration project many years ago. On a grander scale now we've working with Army Corps of Engineers and the Port of Stockton. Our goal is to put stand unit the entire 41 acre stand unit under 36 inches of sand. We're saving the butterfly by weed control. We have a captive propagation program at Moreport College. The butterfly is still in a critical situation. You provide the proper habitat you're probably going to get the creatures back.