california condor Eben Mcmillan 8 November 1963 adults whose neck feathers develop into sort of bristles or wire-like objects. The white coloration under the wings of a Condor is a poor object to use in trying to establish any exact age group for this does seem to vary a good deal from bird to bird of the same age group. Of course we could not study the color development on the neck of the two young birds in the Collection for the Ring- Neck? of the living immature Condor seems to fade out after death. As a Condor becomes older, its upper mandible becomes more hooked and horn-like and the lower mandible shortens and becomes blunt and ivory like. That is Ivory both in color and in texture. We left M.V.Z. at 4:30 p.m. and were home at 9:50 p.m.