San Franciscos Bernal Heights is a hilltop village tucked away in the southern part of the city. Freeways and urban thoroughfares now bound the neighborhood, once defined by the swamps and creeks of the original Mexican land grant. The legacy of Potrero Viejo, or old pasture, and the farms of the 19th and 20th centuries have developed into todays passion for the preservation of open space. From the 1860s legend of Widow OBriens cow to the 1970s fight that saved the hills crest from development, Bernal residents have tirelessly guarded their environment. An unofficial coyote mascot reigns over one of San Franciscos few remaining wild areas.