24 Apr. Wild cat Canyon, Tilden Park, Contra Costa Co., Calif. 113 Class left Tennis courts at N end of park 0830. Proceeded S to ball diamond to observe in riparian willow thicket. Entire stream bed overgrown with wide belt of willows including some small, low elderberry. Observed in one spot during 4 hours: Towhee, California Jay, Stellar Jay, Warbling and Hutton's Vireo, Pileolated Warbler, Downy Wood- pecker, Anna Hummingbird, Grosbeak, Song Sparrow, American Goldfinch, Black Phoebe. Jay feeding "robins-fashion" on ball diamond lawn. Moving N along road again noted Turkey Vulture soaring overhead. Also Grosbeak flying overhead above willow thicket. In willow thicket (riparian) above Jewel Lake Wren-tits observed. At Jewel Lake Redwing Blackbird nesting behavior studied. American Goldfinch, Western Tanager, Coot, Bullock Oriole also seen. Weather warm, clear, sunny entire morning the warmer toward noon. Breezes light. Dismissed at 1200.