Gymnogyps californianus March 15, 1946 Hopper Canyon, Calif. area of adult as if bird were somewhat immature. A few between eye & ear or hind neck too, it appeared. Adult wiped side of head on back & then held bill open for 2+ seconds. Most brilliant orange is between frontal feathers & bill (top & sides of rostrum). 3:12, adult again wiped side of head on back quickly & followed this by holding bill open 2+ sec. 3:20, both preening. Immn. feathered with short dark gray down on back of head & neck. Ventral cervical apterium is grayish - about same color as legs. Down at tops of tarsi. Brownish orange color in mouth. 3:25, the immn. sunned back, holding wings out for over 4 minutes, then slowly bringing them in. Primaries pointed forward & down during sun. ning (hand) - the crop bulge was conspicuous. Lining of wing largely white with brownish triangular area. Immn. preened ruff & wing edge while sunning. 3:42, I noticed adult & The adult put wings up once in regaining balance - there was small dark area in the white lining - a "near-adult". 3:40 I noticed adult & immn. looking down canyon. At 3:42 another fuzzy headed immature landed on high- est perch of whitewash ledge. No light colored stripe at tips of greater secondary coverts was evident on this bird; back & sides of neck had short dark down. The newcomer busily preened, nibbling under scapulars