ford 2928 Gymnogyps californianus March 13, 1976 Hopper Canyon, Cal? land in the same tree however, as about 2 min- tes after the other, & counted 3 sure (5 fairly sure) other condors perched in trees on N. side of Arundell Ridge. 10:02 - about 5 more alight- ed in trees on Arundell Ridge - 3 on Saddle Rd., & at one time 3 on Flat Rd. 10:04 counted 13, 6 being in air near Arundell Ridge. The oft observed pattern of shifting roost to Arundell Ridge from Big Cove area before going foraging is again apparent. Breeze faint. 10:10, counted 9 on Arundell Ridge, Flat Saddle Rd. & another dead Rd. having 2 each. Maximum number of flocks gliding flaps seen - 9. 10:15, an adult circled over lower North Slope, then glided toward Big Cove area. There is frequent shifting between perches - but at least 7 condors in trees on Arundell Ridge. None visible within 300 yds. of #1 nest. Air dead calm at times. Have seen at least 5 airplanes this morning - I went N. over the head of Hopper Can- yon & 2 N. over Reese Canyon. Saw flying planes & the noise of them may disturb the condors. 10:30, at least 5 (possibly 7) still perched on N. slope of Arundell Ridge - no shifts in last 10 min- tes. I proceeded to about 3/8 mile N. of Big Cove. At 10:50 I saw 4 circling over Coda Canyon at cliff top level. One was an immature.