Everybody knows that we are members of the mammalian Order Primates, but ask somebody to name some of our cousins and they would at best come up with five or six of the most widely known. This, the third volume of HMW, counts more than 470 of them: 138 species of prosimiansthe lemurs, lorises, pottos and tarsiers in Africa and Asia; 156 species of monkeys in the New World tropics; another 158 monkeys in the Old World tropics; and 25 apes, 19 of them gibbons along with six chimpanzees, gorillas and orangutans. Much of this extraordinary diversity has been discovered only in the past two decades. In the 1980s the count was 180 species. Now we know so much more of their diversity, and this volume of HMW presents them in all their remarkable variety of shapes, sizes, colors, habits and specializations.Contents: Family Cheirogaleidae (Mouse, Giant Mouse, Dwarf and Fork-Marked Lemurs) Christoph Schwitzer, Russell A. Mittermeier, Edward E. Louis Jr & Matthew C. Richardson Family Lepilemuridae (Sportive Lemurs) Christoph Schwitzer, Russell A. Mittermeier, Edward E. Louis Jr & Matthew C. Richardson Family Lemuridae (Bamboo, True and Ruffed Lemurs) Christoph Schwitzer, Russell A. Mittermeier, Edward E. Louis Jr & Matthew C. Richardson Family Indriidae (Avahis, Sifakas and Indri) Russell A. Mittermeier, Christoph Schwitzer, Edward E. Louis Jr & Matthew C. Richardson Family Daubentoniidae (Aye-aye) Christoph Schwitzer, Russell A. Mittermeier, Edward E. Louis Jr & Matthew C. Richardson Family Galagidae (Galagos) K. Anne-Isola Nekaris Family Lorisidae (Pottos, Angwantibos and Lorises) K. Anne-Isola Nekaris Family Tarsiidae (Tarsiers) Myron Shekelle, Sharon Gursky-Doyen & Matthew C. Richardson Family Callitrichidae (Marmosets and Tamarins) Anthony B. Rylands & Russell A. Mittermeier Family Cebidae (Capuchins and Squirrel Monkeys) Anthony B. Rylands & Russell A. Mittermeier Family Aotidae (Night Monkeys) Eduardo Fernandez-Duque, Margaret K. Corley & Andrea Spence-Aizenberg Family Pitheciidae (Titis, Sakis and Uakaris) Liza M. Veiga & Stephen F. Ferrari Family Atelidae (Howlers, Spider and Woolly Monkeys and Muriquis) Anthony B. Rylands, Thomas R. Defler, Kenneth E. Glander, William R. Konstant, Russell A. Mittermeier & Maurício Talebi Family Cercopithecidae (Old World Monkeys) Samantha Bricknell, Martina V. Anandam, Elizabeth L. Bennett, Tim R. B. Davenport, Nicola J. Davies, Kate M. Detwiler, Antje Engelhardt, Ardith A. Eudey, Elizabeth L. Gadsby, Colin P. Groves, Aoife Healy, K. Praveen Karanth, Sanjay Molur, Tilo Nadler, Matthew C. Richardson, Erin P. Riley, Christian Roos, Anthony B. Rylands, Nelson Ting, Lori K. Sheeran, Janette Wallis, Siân S. Waters, Danielle Whittaker & Dietmar Zinner Family Hylobatidae (Gibbons) David J. Chivers, Christian Roos, Colin P. Groves, Benjamin M. Rawson & Danielle Whittaker Family Hominidae (Great Apes) Elizabeth A. Williamson, Matthew C. Richardson, Colin P. Groves, Barbara I. Fruth, Tatyana Humle, Fiona G. Maisels, F. Blake Morton, Anne Russon & Ian Singleton