Gymnogyps californianus December 29 1947 Hopper Ranch, Ventura Co. road. The tree was 10'+ higher than surrounding ones. They took off within 3 minutes - probably disturbed by our presence (we were indeed uphill from them too)- and soared down the canyon to E. Cool NW breeze, sky 3/10 cumulus. Later investigation revealed that these birds were about 50 yds. from an overflow- ing water trough. I found no feathers or twigs near the water. They were about 150 yds. from a cow carcass. The carcass smelled and was several days old. Eyes were gone, nose & lips seemed to have been chewed, one ear was half nibbled off, & there was a 18" diameter opening above the ribs,& most of the upper ribs bare only shade of meat. I saw no feathers or other evidence that cadavre had eaten on the carcass. Probably these cadavre raested there last night. With Allan Watson I hiked up the canyon W. of the ranch house. At 10:25 slope at I saw 1 adult fly-gliding over the head of this canyon. At 10:45 we crossed the ridge into Wasley Canyon & saw one soaring, wings outspread, facing SE, perched on a limb of the dead P.S. Highest on South Ridge. There were low cumulus clouds over the Leeman area & the radio had reported a light snow there. Fair cool NW breeze. About 11:10 I saw 2 working over the slopes of upper Wasley