The Audubon Center in Greenwich opened in 1942 on land donated by Eleanor Clovis Reese and H. Hall Clovis. It was the first of the National Audubon Society's environmental education centers in the country. The organization's main sanctuary on Riversville Road is also the largest, comprised of 285 acres, with 7 miles of walking trails and the shallow Mead Lake.Perhaps best known for as the site for the Quaker Ridge Hawk Watch, the Center provides one of the best locations in New England to view the fall migration of raptors. The Kimberlin Nature Education Center building, home to the children's learning center, gallery, nature gift store and wildlife viewing window, is also located on the property. The space is available for rentals. Audubon Greenwich is comprised of 11 other sanctuaries (seven of which are accessible by the public) totaling 686 acres of woodlands, meadows and wetlands, and 15 additional miles of hiking trails. Admission fee for non-members is $3 adults, $1.50 children/seniors.