Gymnogyps californianus April 3, 1946 San Diego Cal. get permission there to enter the forest when it was closed. Irving seemed very interested & considerate. I did not meet the supervisor. Went then to the zoo in Balboa Park to see the South American condor. Arrived at the page at 11:25. Label read "South American Condors (Vultur gryphus). Largest of the vultures. Wingspread 9 to 11 feet. Only male condors have manes. The young male hatched here June 1942! Only condor ever raised in a zoo." The birds were in a flying cage about 100 ft. long, both adults perched on highest artificial rock point at upper end of cage & the immature was perched flat on its breast 15 + ft. lower. The imm. was faded brown in color with black secondaries (adults white on upper surface). Comb was already well developed on immature. I saw an adult take off several times, fly the length of the cage & land halfway back, then climb the rocks to the high perch again. The flapping was definitely more rapid than that of Gymnogyps & the climbing of rocks much more sure. Vulture walked with the spring of a boster & at a good speed (frequently nearly running) compared to Gymnogyps and was much more adept at climbing rocks without striking its wings on the rock or slipping, with each extension of springing up a rock steps the adult (?) gave a low pealike grunt (heard many times