 The invasive, non-native signal crayfish lives along the length of Smith Creek.Foothill yellow-legged frogs ("Rana boylei") and California red-legged frogs ("Rana draytoni") are present in Upper Alameda, Arroyo Hondo, Smith, and Isabel creeks.River otter ("Lontra canadensis") are among the rare species observed at the University of California, Berkeley Blue Oak Ranch Reserve (in June 1999), on the Smith Creek tributary of Arroyo Hondo.