Gymnogyps californianus Hopper Canyon, Calif. March 15, 1976 chaser at end of one swoop [drawing], then fell off into glide & chase assumed. Retro- greasing - an anim. Also alighted atop cliff with the 2 adults - all took off when the two left. Displayer showed both red crop patch & red patch at base of neck ventrally (this slightly bulged it appeared). I saw 7 vultures circling together & rising 500+ ft. over Cedar Cliff at 9:35 - some chasing was still going on then. Air cool with light S. breeze; sky clear. 9:42, a group of 5 circling & rising together over head of Pyramid Lookout. One headed SW from 500' above Cedar Cliff. One adult perched atop F lot. Ps. still. 9:45 - no perched birds visible. 9:48, one rising over head of Pyramid Canyon - breeze SE, up this canyon. A group of 3 near Old Colin, working northward above Rim. It's "Rising time" about 9:40 today. 9:51 - 5 (" ") circling over Old Colin area & a sixth circling & working up the slope over Spring Canyon Meadow. Two vultures flew within about 50 yds. of me around 9:30 this morning - I was in open sitting atop a rock. They came at separate times & didn't seem much interested. The display was the closest (about 200yds.) & took place when I was less concealed, than any I recall witnessing before. 9:56, 3 loitering over Old Colin - two 3 heading S. above Rim (100+ above) near Pyramid Look-