Gymnogyps californianus March 3, 1946 Hopper Canyon, Cal. progress. At about 7:30 I saw what appeared to be 2 condors roosting in separate green boulders on N. slope near Arundell Saddle. The lower one, 100+ yds. downhill from the saddle, was about 20' from tree top on the bare part of a heavy horizontal branch. About 8:05 I saw this lower one ruffle up its wings - the bird was then in sunshine - and at 8:15 it took off, glided toward East Canyon with 1 or 3 wing dips, circled 5+ times, rising steeply sometimes and then losing altitude sharply + with a wing dip. A second condor circled below it after a few minutes, & both glided toward Big Cave. The upper roosting condor - 50+ yds. up the slope of Arundell Ridge from the first - I did not verify later. By 8:15 a steady strong westerly breeze - the condors soared + gained altitude with apparent ease. Rising over an E. slope with W. wind seems to indicate use of rising air currents. These two I suppose went to Big Cave to drink or join the gang. I was over 1000 yds. from the bird when it flew so probably didn't disturb it. At 9:30 I was below Arundell Cliffs, halfway up its western slope between creek + cliffs.