They are our closest relatives--and this large-scale, eye-opening book, with a preface by the world's most esteemed expert on the subject, opens a window onto the endlessly engrossing, sometimes dangerous, and often entertaining world of chimpanzees. This particular group lives in the forests and rolling hills of Mahale, a protected national park, accessible only by air or ferry, that runs 100 miles along the shore of Lake Tanganyika. For more than...