A lone black wolf dubbed 'Casanova' covets the daughter of the powerful patriarch of Yellowstone's Druid wolf pack, from the NATURE film In the Valley of the Wolves, premiering on PBS Sunday, November 4 at 8 p.m. (check local listings). Shot in HD over three years, the film captures the Druids as they battle a rival pack for control of Yellowstone's Lamar Valley and shows the interdependence of the valley's diverse wildlife. Academy Award-winning actor F. Murray Abraham narrates. Part of the 26th season of NATURE, the Peabody and Emmy award-winning series produced by Thirteen/WNET New York for PBS. Major corporate support provided by Canon U.S.A. Inc. and Toyota. For more information, visit http://www.pbs.org/wnet/nature/wolves/