Review: The Artificial Ape: How Technology Changed the Course of Human Evolution by Timothy Taylor

(This review first appeared in The New York Journal of Books on 23rd August, 2010.)

The Artificial Ape is a book with a plausible idea, but that is all it has. If you are looking for a convincing argument that “technology changed the course of human evolution” or even some compelling evidence, this is not the book for you. However, if you like informed speculation about humanity’s prehistoric past and you enjoy surveys and summaries of this immensely long and fascinating period, The Artificial Ape will keep you turning the pages.

Taylor is a well-known and popular archeo-anthropologist and is beginning to make himself a name for controversial speculation. His Prehistory of Sex takes us back 8 million years and The Buried Soul makes some startling claims about how widespread cannibalism and vampirism were in prehistory. The Artificial Ape follows in this tradition.

Taylor’s main contention is that tool use in early hominins was a necessary step to allow us to develop our large brains. In particular, he speculates that the invention of the baby sling must have occurred about two million years ago (although there is no actual evidence). This would have allowed a hairless ape with an upright gait—and thus a restricted pelvic gap—to give birth to increasingly immature babies, ones that could not cling to their mothers and would need to be carried, thus allowing the brain to continue to grow and develop outside the womb. As Taylor puts it, turning ourselves into artificial marsupials.

He makes much of the fact that tool use in hominins began about 2.5 million years ago, long before signs of accelerated skull-size began to be seen in the fossil record (after 2 million years ago). It is a puzzle that stone tools were being made and used before Homo ergaster and then Homo erectus began to develop their larger brains, and it is this puzzle that Taylor’s hypothesis attempts to tackle.

Taylor also points to the fact that an ape with an upright gait has a much shorter intestine than one on all fours. This means that not only meat eating but cooking may have been essential precursors to the development of bipedalism, simply because of the difficulty of finding sufficient nourishment from a vegetarian and raw meat diet with a short gut, at a time when we would have been extremely active and burning calories at a rate rarely seen in humans today.

Interestingly, recent evidence, published after the book was released, pushes the date for tool use and meat eating back to perhaps 3.4 million years—the pre-Homo days of Australipithecus afarensis. This find gives Taylor a 1.4 million year gap to explain before brain sizes begin to increase. But it does provide more time for full bipedalism to evolve after tools for butchering meat are first seen.

Given the paucity of the evidence, much of what Taylor proposes must be taken with a pinch of salt. For example, hominin skulls are quite plentiful across the last two million years, but there are only a dozen or so before that time. The graph of brain capacity against time that he presents is quite compelling but it would not need many new data points in the pre-2 million years’ range for it to look very different. More critically for the argument, there are just three hominin pelvises that have been found covering a period of almost 3.5 million years. While they approximately match the required changes in morphology for an ape specializing increasingly in bipedalism and immature neonates, it is very little to base an argument on.

So the book is disappointing in that, having made its surprising but apparently reasonable claim, it then provides scant evidence and only weak arguments in support of it. It is disappointing in other ways, too. It contains long and frequent digressions into areas of human cultural evolution that are not strongly connected to the main argument and which tend to dilute and confuse the message.

While fascinating in their own right, Taylor’s discussion of neolithic art and culture do not contribute much. Similarly, his extended discussion of why Tasmanian aborigines had apparently “regressed” to a level of tool use and a style of living not far removed from that of chimpanzees, while a very useful antidote to Victorian condemnation of and dismay at their lifestyle (which still persists in a mild form in academic circles today), does not strengthen his argument appreciably.

Some discussion as to why other hominids (the great apes) have not taken the same evolutionary path as humans, despite the strong probability that they were as proficient with tools as our distant ancestors were, would have been worthwhile. It is likely that chimpanzees have been using tools for as long as us, yet it has not led either to bipedalism or to increased brain size. The same problem arises with birds. Modern studies show extremely surprising sophistication of tool use in crows and other species of bird, yet we do not see the same evolutionary tie to tool use that Taylor suggests for ourselves. Birds have not become “artificial avians.” Why not?

And the same problem arises with dolphins, which also use tools. Bird brains also raise the interesting problem for Taylor’s hypothesis that their brains are notoriously small. Claiming that tool use (technology) enables increases in brain size, in the face of a crow’s tiny brain, begs the question as to whether the evolution of technologies and brains is causally linked at all. It would have been useful if Taylor had addressed some of these issues.

The Artificial Ape is a good read. It is full of interesting and provocative ideas and information. Yet, while it is interesting and its main idea is appealing, in the end, it fails to make its case.

Review: Cro-Magnon by Brian Fagan

(This review first appeared in The New York Journal of Books on 2nd May 2010.)

By any standards, Brian Fagan is a leading authority on archaeology, and, with 46 books on the subject to his credit, he is among the world’s leading popularizers of the field. In Cro-Magnon, he gives us an easily digested round-up of what is known about the pre-history of modern humans in Europe.

Fagan presents an essentially chronological account, starting with the Neanderthals who were already present in Europe when modern humans arrived, and taking a brief detour to look at the evolution of hominins in Africa. From the arrival of Cro-Magnons around 45,000 years ago until the spread of farming in Europe, about 8,000 years ago, the book traces the movements and developing cultures of these people who were the first homo sapiens to settle the continent. It has a good index and an extensive list of further reading in the Notes section.

If you live in Europe, or are of European descent, then the Cro-Magnons were almost certainly your direct ancestors. Fagan digests and presents for us the extremely complex evidence that reveals population movements and social conditions, without burdening us with details or much controversy. This evidence is mostly archaeological—the bones, human and animal, that were left behind, the stone tools, the excavations, and the paintings and carvings. But he also makes much use of climatological data, studies of modern and recent stone-age peoples, and recent genetic studies, again, sparing us the arguments and supplying only the conclusions.

Fagan works in a field that is massively interpretative. Controversies abound—especially in the assessment of purely social, spiritual, or linguistic aspects of ancient peoples. Yet this reviewer thinks it is a strength of his approach that he delivers what he feels is the most likely interpretation, given a broad, eclectic, yet conservative, summary of the data from many disciplines, merely indicating where there may still be some disagreement among experts. It allows him to present an extended and coherent narrative that makes sense of the whole story of Cro-Magnon settlement in Europe.

And the way he tells it, it was a long, hard struggle. Europe, for most of the time that Cro-Magnons carved out a place there, was a bitterly cold, hostile environment, more akin to Northern Siberia or Canada than to the temperate land we know today. Frozen tundra and barren steppes were what greeted those first immigrants. Yet the Neanderthals had survived there for nearly 200,000 years when we arrived. It is typical of Fagan’s non-controversial approach that he doesn’t indulge in lurid speculation about how modern humans drove the Neanderthals to extinction. It was a slow and gradual process that took place over many thousands of years. In Fagan’s view the Neanderthals simply continued to live their lives as they always had, only with Cro-Magnons hunting the same territories, times just grew harder, until their already-marginal existence was gradually pushed beyond the brink.

Yet, while the absence of detail such as the minutiae of debates about dating and statistical analyses allows Fagan to present the bigger picture with bold strokes, it also leaves you wondering about some of his assertions. He is, for example, very firm on what was men’s work and what was women’s work. How much of that is in the actual evidence, and how much is imported from modern anthropological studies, or even modern prejudices?  And the speculations about whether Neanderthals danced seem fanciful and based on slender evidence (which appears, from what is said, also to be consistent with the hypothesis that they wrestled).

And it isn’t as if there was no room for more detail or more discussion. The book proceeds at the painfully slow pace of a modern TV documentary, with considerable repetition and often tedious dramatizations of life in the late Ice Age. The material in the book could have been presented in perhaps a quarter of the number of pages if not for the slow, repetitious style. 

The book proceeds at a measured pace, to put it kindly, and, while clearly written, the language used is often clichéd and itself repetitive. (There were several points where I thought if I read the words “bestiary” or “tool kit” one more time, I would throw the book down and jump on it.) Which is disappointing because there are sections—like the discussion of Cro-Magnon art near the end—where Fagan writes with fascination and insight. If the whole book had been like that, it would have been such a joy to read. As it was, the book provides a clear, pain-free summary of what is known about the earliest Europeans—it just happens to be a bit slow.

It is a sign of the rate of change in this field that, even as Cro-Magnon comes to press, DNA analysis of a finger bone found in a southern Siberian cave suggests that a third hominin species may have co-existed with Cro-Magnons and Neanderthals in that region. How would the presence of another human line affect the conclusions in Cro-Magnon? Only future editions will tell.