Gymnogyps californianus April 13, 1946 Hopper Canyon, Calif. old primary tip lying on the sand, holding the shaft down with its feet & tugging at shaft+ web. An imm. did likewise with same feather later. The adult carried this feather 8' (& across the pool) in its bill. Once I saw an adult display at another, walking away & toward, tail tail dragging but not spread- Ed got a few frames of this (16 mm.). At one time there were 4 imm. in the pool at once and 8 or 9 in or within 15' of the pool. The auto tent blind did not seem to disturb the birds - adults perked within 70' & an imm. within 50'. Both flew at times & stayed for several minutes. I saw one or more "one year birds"- a chevron of white at tip secondary coverts & gray down at heels. Some red eyed immatures had no wing chevron at all. There were several "in between" or "near adult" birds - the heads of those were fairly solidly covered with black so - but showing the adult coloration through the feathers - only the naker area seemed bare. Crown & occiput were feathered. These had the magenta spot ventrally on neck like adults. As to adult head coloration: the most reddish orange is on the rostrem. The skin area is most yellow. Occiput is yellow but