Academic Reading — Test 180

Reading passage

Few partnerships between humans and animals have reshaped history as profoundly as the one between people and horses. For thousands of years, the horse served as the fastest means of travel available on land, carrying messengers, traders, soldiers and entire migrating communities across distances that would otherwise have taken weeks to cross on foot. Yet the question of exactly when, where and how horses were first tamed has long puzzled researchers, and only in recent decades have new scientific methods begun to supply convincing answers. Wild horses once roamed widely across the grasslands of Europe and Asia, and early humans hunted them for meat long before any thought of riding them arose. Cave paintings created tens of thousands of years ago depict horses with striking accuracy, which shows that these animals were familiar and important to prehistoric people. Hunting, however, is not domestication. True domestication involves controlling an animal's breeding, feeding and movement over many generations, gradually altering its behaviour and even its body so that it becomes dependent on human care. For most of human prehistory, horses remained entirely wild. The grasslands north of the Black and Caspian Seas, a region often called the Pontic-Caspian steppe, are widely regarded as the most likely setting for the first domesticated horses. Archaeologists working at sites in present-day Kazakhstan and southern Russia have uncovered a range of intriguing clues. At one famous settlement, researchers found large quantities of horse bones, together with pottery fragments that, when chemically analysed, contained traces of mare's milk. Since people do not generally milk wild animals, this discovery strongly suggests that the horses there were under human control. Some of the horse teeth from the same period show distinctive wear that may have been caused by a bit, the mouthpiece used to guide a ridden or driven animal, although a few specialists continue to debate this interpretation. Dating these events precisely has proved difficult. For a long time, many scholars placed the beginnings of horse domestication at roughly 3500 BCE, but the picture has shifted as genetic evidence has accumulated. By comparing DNA extracted from ancient bones with that of modern horses, scientists have reconstructed the family tree of the species in remarkable detail. This work indicates that the ancestors of nearly all horses alive today spread out from the western steppe a little over four thousand years ago, replacing earlier and more varied populations with surprising speed. The animals that emerged from this lineage appear to have been calmer and physically stronger, traits that would have made them easier to handle and more useful for carrying loads. The consequences of domestication were enormous and far-reaching. Once people could ride horses or harness them to wheeled vehicles, the scale of human activity expanded dramatically. Herders could manage far larger flocks across the open plains; warriors gained a decisive advantage in battle; and goods, ideas and languages travelled along routes that had previously seemed impossibly long. Many linguists believe that the rapid spread of related languages across Europe and Asia was closely tied to the new mobility that horses provided. In this sense, the taming of a single species helped to knit together distant human cultures and to lay some of the foundations of the connected world we know today. Modern research on horse domestication is notable for the way it draws together many different fields. Archaeologists supply the bones, tools and settlement layouts; chemists identify the residues left in ancient pots; geneticists trace lineages through fragments of preserved DNA; and historians of language add their own evidence about how and when populations moved. No single discipline could have produced the current understanding on its own. As techniques continue to improve, particularly in the recovery of ancient genetic material, researchers expect the story to become richer and more precise. What already seems clear is that the bond between humans and horses, forged on the open grasslands of Eurasia, ranks among the most influential developments in the long history of our species.