Joseph M. Forshaw, one of the world's leading authorities on parrots, calls attention to the threats they face: They are one of the most endangered groups of birds, with a growing number of species nearing extinction. The main threats arise from habitat loss through deforestation and agricultural development and from the taking of birds for the... 344 pages, 17 Illustrations, unspecified; 79 Maps; 59 Plates, color Forshaw, Joseph M.