… Small mammals include the Black-tailed Jackrabbit , the Western Gray Squirrel , and California Ground Squirrels . Visitors should be advised that Northern Pacific rattlesnakes are very common. Southern Alameda county has the high density of nesting Golden Eagles , thus, they can be seen often, along with Turkey Vultures , Red-tailed Hawks , Red-shouldered Hawks , Prairie Falcons , and Sharp-shinned Hawks . They also nest here, usually in steep valleys on the slopes, where no trails enter. Restau …