2886 Gymnogyps californianus February 13, 1946 Hopper Canyon, Calif. 15' outside the entrance, apparently, & just above it. A 5 ±' sprig of Yuba Santa grows down from top of entrance. This cave is 200' down canyon from the lowest cascade of Corder Falls and faces about NW. It is about 100' above creek bed - a steep climb but not difficult as slope is shrubby. Left this next cave & went up Corder Creek. At about 2:15 saw 4 cardors over North Slope apparently heading for Big Cave. At 2:40 saw 4 circling over North Slope. At 3pm saw 8 at Big Cave - 2 were imm.; one imm. swooped up to a top branch of Roost Tree. Others were on Whitewash Lodge. 3:10, one adult was chased by duck hawk - the whistle of wings brought my attention to it - no contact but about 2' from it. The cardor landed immediately on White wash Lodge. By 3:15, 10 cardors & 1 ± by 3:20. Fat Roost were imm. Two sunned backs briefly with wings outspread. Adult atop Roost Tree facing NW & evening; imm. 2 ±' lower & 6 ±' away facing adult, & quiet. I was setting 200 ± yde. NW of Big Cave. 3:28 3/4, 2 imm. & one adult sunning lodes. One adult appeared to have the outer right secondary missing. 3:26, now - 14 cardors (6 imm.) at Big Cave. One imm. had scoty head but pinkish neck with red patch in front of neck. 3:28 - now 16; 2 on Roost Tree, 2 atop cliff near Big Cave, rest on