For the sort of animal fanciers who go to any and every zoo they can reach--zoo history and first-hand observations ranging all over the U.S., Australia, Russia and Japan. Much of this appeared first in the New Yorker but it's not parochial; the pleasant conversational style carries a lot of information most easily--the various methods of animal display, zoo architecture, their research programs, the backgrounds and special concerns of zoo directors, the acquisition and care of the rarer animals as well as of the crowd pleasers. There is no better current book for the general reader.