evidence: The vegetation on plains and deserts includes wormwood and tamarisk, with feather grass on drier plains. Kazakhstan has very little wooded area, amounting to only about 3 percent of the territory. Many animals, including antelope and elk, inhabit the plains. The wolf, bear, and snow leopard, as well as the commercially important ermine and sable, are found in the hills. Fishermen take sturgeon, herring, and roach from the Caspian Sea. In parts of northeastern and southwestern Kazakhstan, where commercial fishing collapsed as a result of industrial and agricultural pollution, efforts to revive fish populations have shown some success. In 2008 Kazakhstan’s Naurzum and Korgalzhyn state nature reserves were named a UNESCO World Heritage site; both are important habitats for migrating birds, as well as for many other animal species.