4 wolf 1964 30 Aimophila hamerlini July 26 Canyon de los 9 mi E Cusmanaca, Mulas, Mexico (1400#) + joined by chipping bird. Continued chipping the way on low (3:') Acacia limb + sang once then flew down hill to 700' = P walked near. Then bird up onto Acacia limb when giving pitz-a calls. Heard chatter from twin branches & saw two male birds drop from 11-24" up to 12:" up then led by bird #1 all 3 flew up to tree 20+yds down hill from tree #1. Pair gave chatter while #1 was silent. After chatter #1 began pitza calls. #1 then to top of tree #1 when gave pitz-a calls. Pair flew into tree #1 about 5yards up + chattered from subcanopy, then they moved off to S into "mock orange" while #2 bird stayed at top giving pitz-a calls. Another bird also began pitz-a from 20+yds. 8 yards from tree #2. Bird #1 flew to tree #2 + gave pitza's. Bird up hill continued calling for 30+sec + then quiet. Bird #1 continued calling from tree #1 + then flew uphill to other tree (10+yds) + called. Now only bird calling except for single chatter from pair #1 in mock orange itself. At 1027 chatter from tree uphill from #2 preceded by 2 birds giving pitz-a including bird #1, but not sure which giving chatter or relationship of bird #1 forest of pairs. Then quiet. 1105 - bird not on root #1 when shaded. While being 8" chipped + then drop from undergrowth just uphill.