The introductory history of human taxonomy sets us up for the discussions to follow and reminds us of our tendency to read more into human history than can reasonably be inferred from the evidence. The racist sentiments of 19th-century anthropologists found firm footing in their theories, and we can only wonder what mistakes we're making today. Doing their best to eliminate extraneous details, Tattersall and Schwartz provide a lean, parsimonious theory to guide anthropology into the 21st century, as we try to learn why we're the only ones left. --Rob Lightner

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A major strength of the book is discussing the changes in paleontologists' approach to the taxonomy. An example of a major change is Homo habilis, thought to be the first true tool-using homonid. Consider what happened with one of the so-called "type fossils." Type fossils are the ones that the original definition of the species came from. The problem concerned the type fossils of Homo rudolphensis, known as ER 1470, which were quite famous. H. rudolphensis was an important hominid find with a larger cranial capacity than homo habilis, and was considered a more evolved, later species. It's mostly known from an upper jaw and palate and portion of skull. However, it was discovered that the upper jaw mates almost exactly with OH 64, an Australopithecine lower jaw from Olduvai Gorge (OH means Olduvai Homonid). If this is true, Homo rudolphensis disappears as a species and OH 64 no longer belongs in Australopithecus. As the authors point out, that was especially ironic since ER 1470, although it's still currently assigned to H. rudolphensis, was originally put in H. habilis and was the find which finally convinced scientists that there was something to define the species after all, despite the chaos that had reigned up to that time.

Their difficulties didn't stop there. Because of the enormous influence of evolutionary biologist Ernst Mayr and the population geneticist Theodosius Dobzhansky, whose ideas caused paleoanthropologists to think in terms of a single, evolving homonid line from Australopithecus to Homo erectus to Neanderthal to Homo sapiens, paleontologists were for many years reluctant to create new species for their finds, despite the obvious difficulty of fitting so many anatomically distinct fossils into a single species of Homo habilis. As a result, H. habilis became a virtual dumping group for various fossil finds, and only in the last decade were all the different finds reconsidered.

The authors include superb discussions of the fossil and cultural (tool-making) evidence for Homo heidelbergensis and Homo antecessor, considered to be the last common ancestor of the homonid line which led to H. sapiens and Neanderthal. H. heidelbergensis, they point out, also has become a convenient dumping ground for a number of fossils 300,000 to 600,000 years old which have a cranial capacity of around 1200 cc, very close to modern norms. It had robust limbs but more or less modern bodily proportions.

H. antecessor is associated with fossils as old as 789,000 years. It's associated with not so much stone tool-making, which remained relatively primitive, but with evidence at two different sites in Europe of advances for home construction. One site shows a large home constructed of planted saplings drawn together at the top, and the other shows clear evidence of a dwelling with a permanent hearth. Hence, H. antecessor is thought to have domesticated fire.

Finally, there's an introductory chapter discussing the early history of comparative fossil anatomy, including the important work of Blumenbach, who founded the science and improved on many of Linnaeus's ideas, especially the definition of the genus Homo, and our own species, Homo sapiens.