Gymnogyps californianus April 8, 1946 Hopper Canyon, Calif. found 2 scats, black, one 3" long on the cave floor. No scours or other scat evidence here. I collected 22 +/- bone fragments of apparently old age from the cave floor. There were two damp spots possibly from excreta. The whole interior of this cave bears old whitewash to about 20" above the floor. The upper portion is pink - possibly an alga that thrives on excrement. Thus I believe this to be a much used cave. The failure of this egg may explain the mating displays I have seen near this cave after egg was found. Cause of destruction: possibly ravens. Perhaps adults broke it. Perhaps my March 3 visit kept the birds off too long & egg addled - very doubtful, else they would still be incubating a whole egg. No rocks larger than about 2" long on the floor +/- of possibly recent origin - the fall from the 4' high ceiling might break or chip the egg however. There were 3 or 4 squirts of old tobacco or oil colored excrement on the walls. The floor plan of this cave is about thus: Entrance to cave shaped: nest #2 mag width #11 18" occurring 16" above floor. Practical height 25". From cave entrance to rear (near rocks) - 49". I then investigated the slope starting 30 +/- below the next cave