At ``Step 2'' in the useful ``Step into Reading'' series: an admirably clear, well-balanced presentation that centers on wolves' habits and pack structure. Milton also addresses their endangered status, as well as their place in fantasy, folklore, and the popular imagination. Attractive realistic watercolors on almost every page. Top-notch: concise, but remarkably extensive in its coverage. A real bargain. (Nonfiction/Easy reader. 6-10)