Plantings of eucalyptus groves are also present at scattered locations. The park grasslands provide habitat to western meadowlark, horned lark, house finch, western bluebird, and American goldfinch, which forage and nest in the area. Valley oaks offer perches and nest sites for the red-tailed hawk, American kestrel, golden eagle, northern harrier, great horned owl and barn owl. Cooper's hawks depend on the riparian ravines for nesting and for providing cover for ambushing prey. Mammals include the gray fox, mule deer, raccoon, eastern fox squirrel, Botta's pocket gopher, and a variety of other species.
Small rodents are prey to gopher snakes, sharp-tailed snakes, and western garter snakes.
This parkland provides a gateway to the river delta region along the northern edge of Contra Costa County. The coastal hills rise steeply up to 750 feet above Carquinez Strait. From the highest elevations the view includes the marshland of Benicia State Recreation Area to the north across Carquinez Strait. From atop Franklin Ridge along the Franklin Ridge Loop Trail and the California Riding and Hiking Trail, the horizon is pierced by the peaks of Mt. Tamalpais to the west and Mt. Diablo to the east. Looking south from this high point are the ridges of Briones and Las Trampas regional parks.