2884 Gymnogyps californicus February 13, 1946 Hopper Canyon, Calt. 18" to 20" high on same walls. But this cave shows not so much screment or as many bones as some others - the whitacre one for instance - so may have had a chick only once in recent years. A cross section about halfway in from entrance to rear (30' total) appears about: a cleft above for 10' rear triangle trough to mouth Light breeze only; sky clear. I collected bone fragments for specimens & departed cave at 11:30. Had occasionally seen 1 to 3 condors over Hopper Basin while at cave. Rear of this cave quite dark so that I had great difficulty in searching for bones. The point at W. side of cave mouth was only one with even moderate whitewash - no thick chalky deposits here. Investigated below Whitewash Lodge & Carda Falls then until 12:30 - no condors some near. I found 20+ primaries + secondaries, & below Whitewash Lodge, where screment thick, I found a hair ball (den it appeared) such as work reported; perhaps a condor pellet. Then went down Carda Canyon & visited #9 nest below lower falls in Carda Canyon. Apparently it had not been used since 1941 although one point at mouth was well whitewashed (ravens?).