Draws are the headwater drainage patterns that eventually lead to rivers.Draws are usually shallow (less than 30 feet deep) and narrow (less than 1,500 feet across).Draw bottoms will often have pocket forests of hackberry and soapberry trees.Draws often serve as travel corridors for wildlife.Wild turkey, white-tailed deer, Virginia opossum, and many other species of animals have immigrated to the southern Llano Estacado in the last 50 years using the draws as their highway system.Animals also seek protection from winter storms in draws since they are lower than the surrounding areas. Plant species from further east can also be found in the draws because the soils are richer and contain higher moisture content for longer periods of time.Draws of the Llano Estacado cut through a variety of soil types.The bottoms are often composed of clay supporting a flora similar to that of playas.Sandy soils with shin oak occur on the north and northeast sides of draws.Downstream, pockets of old growth trees may be present.There may also be clusters of young, mature, and mixed-aged trees.And in some places, draws have become chocked with the introduced and invasive salt cedar.