Owl’s Hill Nature Sanctuary in Brentwood, Tennessee, is a 300-acre wildlife sanctuary in northwestern Williamson County. Fossil traces in Ordovician limestone and 300-year-old giant trees, vestiges of the great eastern deciduous forest that once covered Tennessee, are important collections on the site, as are pioneer trees and seasonal wildflowers. The ponds and wetlands provide valuable amphibian habitat, home to more than a dozen species. 125 species of birds have been recorded on site through population surveys performed by the National Audubon Society. Nearly all mammals native to Middle Tennessee are in residence at Owl’s Hill.