3010 Gymnogyps californianus April 11, 1946 Hopper Canyon, Coli. P. Of the calf Walker Hill put out last April 6, only one leg remained. The grass was somewhat trampled thereabout but there were no fragments or feathers to indicate that crows might have been there. Apparently good soaring conditions today. 67° F. at 3 p.m. There were a few flies on the doe for had replaced the old calf by under it. May 5/10 corvidus & breeze light by 4 p.m. At 4:15 I saw at least 2 crows soaring back & forth near Big Cave & alighting in potholes or on ledges there. We left blind at 4:30. At 5 p.m. from Old Cabin I counted at least 5 crows - 1 adult atop Flat Pt., two on Roost Tree, & the others on cliffs & ledges at Big Cave. Returned to base camp. April 12, 1946 also Hopper Canyon, Coli. P. Our calm overcast with stratus clouds. Neither sunshine nor wind - so poor soaring conditions presumably. We went to North Point to investigate the #12 nest cave there. At 8:15 I saw 2 crows on Roost Tree. Below the nest cave in the brush scattered over about 20 ft. I found fragments of the egg - about 1/3 of total loss. Also I found 4+ bone pieces which may have come from nest. Finally descended to the cave but because of overhang could not get in. The entrance was about 18" wide at base, narrower above, D shaped. It was about thus in floor plan O, there.