Twelve Hills Nature Center 
817 Mary Cliff Road
Dallas, TX 75208
(469) 249-2817
http://www.twelvehills.org/
Nature Center: Birding, Picnic, Walk
Twelve Hills Nature Center is an urban preserve located in the Oak Cliff neighborhood of Dallas. It serves as an outdoor classroom and passive recreational area. It seeks to educate both adults and children about environmental stewardship and community-building through the grassroots creation and maintenance of a native Texas blackland prairie, and small wetland. Admission is free.