Hardcover. NY, Lothrop, 1st , 1999, Book: Very Good, Dust Jacket: Very Good, Hardcover in a bright, unclipped dust jacket, color illustrations by Ted Lewis - their first collaboration. The Lewins trek through the heat, humidity, mud, and dense vegetation of the Impenetrable Forest of southern Uganda to visit mountain gorilla families and observe the gorillas in their natural habitat.
 "Gorilla Walkby: Lewin, Ted and Betsy")