Subtitled "Tree-Kangaroos, Possums and Penis Gourds, On the Track of Unknown Mammals in Wildest New Guinea," this witty account of a scientific expedition to New Guinea combines natural history, adventure and insightful commentary on local communities. A wonderful writer and top-notch scientist, Flannery returned from the expedition with 20 new species of mammals -- including a tree kangaroo and bat thought extinct since the Pleistocene. With sketch maps and photographs (including shots of the handsome ground-living tree kangaroo that Flannery discovered in the high mountains of Irian Jaya in 1994). "Throwim way leg" in the local idiom means to go on a journey.  (NGA18, $14.00)