Here is an examination of the reasons and methods which go into making the schools, flocks, herds, packs, troops and colonies that define the community divisions of animals, fish, birds and insects. Field studies that have lasted through years of patient observation are reported on -- the techniques as well as the findings. Black and white labeled drawings that are high in accuracy and eye-appeal are placed in the text at the necessary points. It is evident from the bibliography that a very specialized collection of adult books has been gleaned for this information and that the author's reputation for well researched books has been maintained. While the subject is limited to the social behavior of animals and the factors that produce it -- food, protection, survival -- the book has these bonus extras; good writing; fine illustrations; a useful index; and last but not least, a presentation of fascinating adult material brought down (without talking down) to an audience that will appreciate this respect.