Gymnogyps californianus July 25, 1946 Hopper Canyon, Calif. active, occasionally preening. 3 p.m., still no action - 1 adult was crushed flat & another had shifted to another branch at some lower level. One adult preened at jump, head down back, tail brought forward to side [illegible]. Then brushed back with shin & neck, from scapulars back, over right then left sides, about 4 wipes per side. Later preened side from our back, wing slightly out from body. Then anal region with tail fanned & held nearly vertically & brought forward [illegible]. 3:12, a third adult now in tree 100' yds. NNE of bait. One about 4' above another, reaching its hill down toward the one below. The lower sprang up to higher perch & the upper flew off, circled back, & landed 20' lower in same tree. Fourth adult above as before. 3:19, I saw one descend from 1 branch to another about 3 "steps" of about 4, 5, 48', each by carefully looking our next step, then jumping with feet together, wings moving in falling, & landing on the new perch. In moving out a branch, adult sidestepped, moving 1 foot at a time. Three were 10' apart in lower tree; middle had descended 20' & seemed very interested in the lowest; lowest seemed to look over the middle one; both of these off at 3:25, to ? Two, probably some, circled & rose over the E. Rim opposite me at 3:28. Two adults still perched, 1 on flat on the branch (exp 3:31) - the latter took