Founded 1935, oldest national wildlife refuge in Texas. Established principally for migratory waterfowl, also home of native wildlife. Three small rainwater lakes, unusual features on the plains, attract the birds. Hunting is prohibited, but photography permitted. Among species wintering here is nation's largest concentration of sandhill cranes. Greatest numbers of waterfowl may usually be seen between late Aug. and Mar.; colony of prairie dogs is along entrance road. Open daylight hours. About 20 miles south on Texas 214.