http://cei.org/pdf/1366.pdf Smith, Robert J. Private Conservation Case Study The Kern River Preserve] December 1996 The 3000 acres "80-acres Protected as Pond Ranch becomes part of the Kern River Preserve" preserve provides habitat for rare and Audubon's endangered birds, one of which is the federally listed endangered southwestern willow flycatcher, US Fish and Wildlife Service, Species Profile a subspecies of the willow flycatcher.