Peter Crowcroft's study of mouse behavior is both witty and deeply learned, and it will appeal to both academic and popular audiences. Anyone interested in mice--as pets, as objects of scientific study, or as both of the above--will enjoy reading about Crowcroft's determination, and ultimate success, in setting up his experimental "mouse houses" and in designing social experiments with his homegrown mouse communities. Crowcroft's writing style is lucid and his interest in his subject is contagious. Readers will come away from his text with a deeper appreciation of these small but highly complex creatures.