Gymnogyps californianus March 3, 1946 Hopper Canyon, Calif. as near as I could see. about One of the pair took off & the other remained (about 9:45). About 10 a.m. two adults alighted atop N.Arundell Cliffs about 400' E. of Cove Point. Both had ruffs down showing magenta spot at base of neck ventrally & light grey above this, then range of head. One displayed to the other, head upside down and wings as before diagrammed. Displayer took very long steps it seemed in pacing back & forth. He (?) stopped & recommenced a few times. His (?) cheeks were puffed & crop bulged, showing magenta patch. She (?) had no bulge but same head coloring. Maximum reaction was that displayee nibbled head of displayer - I had 20x telescope on them birds about 1/4 mile away in sunshine. about 10:03 both stood quiet - I made some matter in putting on a sweater. Both adults soared directly across canyon & 70±' above me. I was 500±' W. of Bretta's nest at this time. after a few turns, the displayer alighted atop a Pseudoturga 75± yds. W. of Bretta's nest & displayer - crop still bulging & a ragged patch in left secondaries - circled over me for 3 ± minutes - sometimes 1/4 mile away.