of forested wetlands and upland hardwoods, with main species consisting of red and white oaks, hickories, poplar, ash, and tupelo; 3,000 acres (12 km2) of pine plantations, much of this subjected to sanitation cuts in the mid-1990s due to Ips beetle and pine beetle infestations; and 4,000 to 5,000 acres (16 to 20 km2) of farmland, with the remainder including open shelves, rocket test ranges, and other areas. This mix of habitat provides for a wealth of wildlife diversity on the refuge. Wildlife and protected species Wheeler NWR has supported up to 60,000 geese and 100,000 ducks, although recently these levels have declined to approximately 30,000 geese and 60,000 ducks. Since 1990, winter goose populations have dropped significantly due to many different factors; below 15,000 from 1990 to 1995 and about 2,500-5,500 in the last few years. Snow geese are now the most prominent component of the winter goose population, peaking near 1,500-3,200 in recent years. In addition to migratory birds, the refuge hosts 115 species of fish, 74 species of reptiles and amphibians, 47 species of mammals, and 288 different species of songbirds. Some common mammals include squirrels, raccoons, opossums, rabbits, quail, and deer. Approximately ten endangered species which live on the refuge. There is also a small population of American alligators present within the reserve; they were reintroduced into the area following historical extirpation from northern Alabama. Facilities Wheeler NWR offers five hiking trails ranging in length from to four miles (6 km), providing opportunities to view wildlife in a wide variety of habitats. Additionally, six improved boat launch areas provide access to the Tennessee River. Hunting and fishing Fishing is very popular at Wheeler NWR with an estimated 200,000 annual visitors. The Tennessee River provides excellent fishing opportunities for bass, sunfish, crappie, sauger, and catfish. Public hunting is permitted on approximately 18,000 acres (73 km2). Wildlife observation The main visitor center provides an overlook of a waterfowl impoundment for birdwatching as well as the opportunity to see a red-tailed hawk. Several other spotting scope stations are set up throughout the refuge. Additionally, a wildlife observation tower is located on the north side of the Refuge and provides an elevated view of the Beaverdam peninsula, an area of the Refuge managed primarily for Canada geese. Each winter, the area is filled with thousands of Sandhill Cranes. The endangered Whooping Crane has been spotted regularly each winter for the