With his familiar, engaging simplicity, Mr. Franklin writes about Bravo, a bighorn ram of the Rockies. When his mother was killed by a mountain lion, Bravo became a ""bummer""- a kid who had to go about the herd begging milk from the other ewes. Fortunately he falls into the good graces of Krinklehorn, the chief ram, and from him learns the good and the terrible ways of life and eventually follows in Krinklehorn's footsteps. Suspense, pathos and pertinent natural history make a passport to popularity.