Gymnogyps californianus April 14, 1946 Hopper Canyon, Calif. perches 7:20 the 4 imm. + 1 adult near pool all flew at once as if in fright - 2 mins. alighted about 50 yds. (Probably camera movement.) NE of the pool on the rocks. I saw no cause for alarm. at least 2 flew down the canyon. 7:23, 5 atop cliff + 6 on ledge or cliff face. Sunshine now sp on part of Whitewash Ledge. Before 7:20 I saw one imm. perch at + carry an old feather near pool, + one pick up a long grass stem stalk in bill & then drop it. The bird went about 40' back from falls limits & walked about in green grass. One imm. perched at soil & plants atop cliff over Big Cave. Heard a loud suppressed belch when adult near. Adult jumped at an imm. near pool & imm. fled - I heard then a growl or snarl from one of the two, 7:34, 6 imm. + 2 adults (adults side by side) atop cliff above Whitewash Ledge - this 20' x 30' (approx.) slanting table seems a favorite gathering place. One adult there crouched flat at cliff edge f. 7:37, an adult & imm. sunned backs, wings spread, atop cliff over Big Cave. 7:40, 7 in sunshine on Whitewash Ledge - 1 adult crouched flat, all seemed intent as if basking in the sun. One adult still on shaded ledge above Big Cave. 7:50, 2 adults + 1 imm. of the 8 total on Whitewash Ledge are crouched flat; 8 atop cliff above these, all but 2 immatures (some immatures visible at brush at edge of rocks); 1 on ledge over cave as be- fore (adult) and 1 imm. atop cliff ¼½ mile to N. Alley