1954 Calypste anna June 25 Queens Rd., Berkeley Young male established on hillside below house, singing 1956 Jan. 16 U.C. Campus, Berkeley Adult ? on west side of Wheeler Hall in aerial display as I walked by. When first noticed it was diving, and did so about 8 times, by which time I was standing at the base of the slope bearing the brush toward some part of which the dives were directed. At the end of the last of these dives, it flew to A and began a typical circle-display, singing, then flying to B, singing, then back to A, then to C (which brush was the focus of the dives), then to B, then back to C, within which brush it progressed in semicircle along E + D side, addressing song and display to some point within the brush. By this time I was standing deep the lower, to west side of the bush trying to locate the focus of attention suspected to be a ?. I discovered an adult ? sitting at the end of a pendant branch, stiffly and quietly with bill facing upward, and he remained thus then the time I moved about. Shortly after locating him I withrew downslope and watched. In the meantime, the displaying ? moved to A