Gymnogyps californianus April 8, 1946 Hopper Canyon Clift. swirled imm. condors swirled 100t 'over canyons & vicinity until 8:45 then worked S over the canyon. The early rising of the condors may well have been cased by the fogged-in conditions of last 2 days. Sky 3/10 cumulus, temp. 520F., breeze light or absent. One adult which soared nearly at 8:17 had a slot in center of right secondaries, a space in tail [2], & a #8 primary missing. Got stuck in mud, so I set out for #1 nest via ## #1 nest x Hopper Creek. At 9:10 I saw one adult circling just N. of Hopper Canyon. It had a slot in center of secondaries of both wings & a #3 primary missing. 9:15 - saw some or another there (300t' alt.). Started down the canyon. At 10:15 I saw 1 condor overhead. 10:25, I was below #12 nest in creek bottom. I saw no activity at the hole. Bottom cliff for about 2' below hole conspicuously whitewashed. 10:30, I saw 1 overhead. Cloudiness increased to about 7/10 by 11:15 a.m. At 12 m. I was below #11 nest cave I had seen no condors in the vicinity. I climbed the cliff and entered cave about 12:20 - the egg was gone but 3 fragments of shell (about 4/2 square each) showed that it had been destroyed rather than "collected". The points outside the cave were clean of whitewash so the destruction must have occurred some time ago.