64 Journal R.E. Johnson 1967 Jan. 14 Wildcat Canyon, Tilden Regional Park, Contra Costa Co., Calif. Zoo 107A Field Trip to Tilden Park. 13 individuals in my field group. Clear, cool, and windy on arrival at 8AM, warming with wind dying down during day: The wind may have been responsible for the small number of birds seen early in the morning as compared to Jan 11 & 12 when the same route was followed (Tennis courts to Jewel Lake). The species seen were as follows: White-crowned Sparrow Brown Towhee Chestnut-backed Chickadee Plain Titmouse Cooper Hawk Calif. Quail Rufous-sided Towhee Wren-tit Hermits Thrush Varied Thrush Ruby-crowned Kinglet Oregon Junco Red-tailed Hawk Red-shafted Flicker Yellow-bellied Sapsucker Black Phoebe Mallard Coot Canvasback Bufflehead Ruddy Duck Canada Goose Pine Siskin Gull Glaucous-winged Anna Hummer Scrub Jay 23 species