We know the precious species on the world has a lot of, for instance sturgeon of giant panda, China, Chinese alligator, these animals need our mankind's collective protection ability to live go down. Still have actually on this world more precious than giant panda, and will be faced with ruined. This species is demon Zuo , dead gorge is in glacial times, freely of here water system. The Zuo fish with not big build, it is with respect to perch since glacial times over there, the biologist call his " developmental miracle " , people says it again " demon Zuo " . Demon Zuo is the most peculiar fish on the world, also be the most precious at the same time with one of old live thing. They are in the United States the difference in temperature of dead gorge day and night of Nevada is great, fountainhead tall salinity, anoxic lived tens of thousands of years below harsh environment. Suffer agriculture to irrigate influence, local underground water level drops somewhat, make area of Zuo fish habitat ceaseless and contractible. Go up century at the beginning of 90 time, the Zuo fish of dead cereal has many 500 only. Now, survived 60 thousand old, 38 when the whole world puts only " demon Zuo " whole life is close in devil hole 150 rice, wide in a few pond of rice. Because species is rare,be short of, people took all sorts of safeguard. To protect them, tourist will be restricted when visiting devil hole, the 2.4 meters tall, crawl erect that takes wire is in pond all around. Want to know, although Zuo fish is small, mix with giant polar bear however giant panda is euqally precious. Some closer the amount reduces year of Zuo fish gradually, a lot of zoology experts can find no way out, want to had been protected rare be short of species to need to have a detailed and comprehensive plan really, had plan ability better the area is carried out.