P. Telka 1947 Thryomanes bewickii May 11 Woolsey Canyon. Example of male behavior along territorial boundary observed completely. Male A established at lower end of south draw; male B established along main stream, just to east. Both males heard singing and approaching each other; each progressed as far as a large laurel neighboring a trail on which I stood. From the east, male B approached as far as the cluster of small trunks and surrounding shrubs; from the southwest, male A approached as far as the dense peripheral laurel twigs and foliage of the lowermost arched branches close to the ground. Under the arched branches was a space of 25 feet separating the two males. Both sang and uttered a characteristic harsh and loud alarm note (zree) repeatedly between songs. Occasionally, a softer chatter wik-kik-ki was given. Male A did not display, but male B hopped about actively, his tail erected and spread and wings drooped slightly. Male A moved toward male B from the south; at this moment activities could not be seen, but male A returned promptly to the laurel branches. Calling continued, with less singing. Male B flew out to the middle of the open space, circled, returned. A few seconds later he repeated this, flying within 8 feet or so of male B, hovering and circling then returning to the trunk cluster. After this second flight male A moved off into his territory, and male B did likewise.