Gymnogyps californianus March 16, 1946 Hopper Canyon Calif. 7:27. 7:31 there was a group of 3 adults which had been together 10 ± minutes. Suddenly one lunged at a second, the second took off, + the linger followed 30 ± sec. later - a fuzzy headed immature alighted in its place. Imm. sunned ledge. 7:33, another dark headed imm. alighted 5 ±' below the scanner. Adult 30 ±'ft. higher on the Whitewash Ledge took off down the canyon. The imm. sunned almost cateri-narily for about 6 minutes. Lower imm. took off at 7:49 leaving adult + imm. 8 ±'apart on a shelf below Whitewash Ledge (only 2 visible). Clear sky. Fair wind by 7:50. 7:54, a second fuzzy headed imm. joined the 2 cordon on some leds shelf. 7:58 an adult alighted atop cliff over whitewash Ledge (2 min. + 2 adults now visible). 8:10- the 3 groups preened. One imm. had poor wing stripes + fairly uniform brownish white underwing pattern; also light colored at base of neck. Preened with wing sagging at side. Adult atop cliff had ruff way up ~40°F in blind. About 8:25 adult atop cliff left + 1 imm. from below. Other imm. was in shadow as adult seemed back for 7 ± minutes (only left wing out last minute). The imm. left + adult 2 ± min. later at 8:32.