Gymnogyps californianus March 15, 1946 Hopper Canyon, Ca/17. tops toward Big Cave to watch from blind there. at 9:15 stopped about 1/2 mile N. of Big Cave to watch. Saw 2 circling near #1 nest. 1 saw 4 pedi- cled in separate tree on N. slope of Crumbell Ridge - at 9:25 only 1 perched adult still visible there & about 5 in air nearby. 9:25, an adult alight- ed atop the high rampart 1/4 t mile N. of Big Cave. I had a good view with telescope - red crop patch was conspicuous. About 9:27 two adults alighted within a few feet of the one. One walked 10+ up the rock with wings as if to balance. One displayed, walking around facing another. The displayer held wings ^A and head (F), tail dragging on the rock. The displayer backed away several times. & displayer had to walk around this adult. One adult twice put its head under the tail of displayer from the rear & right side & appar- ently plucked at the feathers in anal region. The displayer pecked at another adult & the second flew off, the displayer reaching the rock out at it with bill wide open. Then displayer took off & chased the other adult - they swooped up flapping in front of Big Cave & the chased one turned in the air so as to bring feet up toward the