Ancient South American Hunters Thrived on Giant Megafauna, New Research Reveals

Megafauna was the Meat of Choice for South American Hunters

The story of early human survival in South America is inextricably linked to the continent’s now-extinct giants—megafauna. For millennia, enormous creatures like giant sloths, glyptodonts, and ancient horses dominated the landscapes of the Pampas, Patagonia, and central Chile. Recent scientific breakthroughs have reshaped our understanding of how pivotal these animals were to the diets—and destinies—of the first South American hunters.

The Rise of the Giant Hunters

For decades, the role of humans in the extinction of South America’s megafauna was downplayed. Many archaeologists believed that climate change was the principal driver of extinction and that early hunter-gatherers played only a minor role, partly because of a perceived lack of archaeological evidence showing humans regularly hunted these large animals[1]. However, new research has upended this view.

A comprehensive analysis of 20 archaeological sites in the Southern Cone—modern Argentina, Uruguay, and Chile—has revealed that megafauna were the primary prey of early South American hunters from about 13,000 to 11,600 years ago[1][3]. In these sites, remains of giant mammals overwhelmingly outnumber those of smaller animals, indicating that giant sloths, armadillos, and horses were top choices for meat[1][3]. This evidence suggests not only that megafaunal hunting was central to human subsistence but also that the decline of these animals dramatically reshaped human diets and settlement patterns.

Why Megafauna?

The preference for megafauna was not arbitrary. These animals offered enormous returns for the energy invested in hunting them. A single kill could provide food for an entire group over an extended period, along with hides for shelter and bones for tools[1][3]. The economic calculus was simple: large prey, big payoff.

Archaeological bone assemblages from key sites such as Fell Cave, Paso Otero 5, Campo Laborde, Tagua Tagua, and Cueva del Medio paint a clear picture: extinct megafauna dominated the faunal remains[3]. Smaller game—like guanacos and rheas—are present but were far less important in this period. Only two of the 20 studied sites lacked extinct megafauna, and in these rare cases, smaller terrestrial or marine resources filled the gap, likely due to local ecological limitations rather than human preference[3].

Hunting Technologies and Adaptation

The centrality of megafauna in early diets is also reflected in the development of specialized hunting tools. The so-called Fishtail Projectile Points (FPP)—fluted stone points similar to the Clovis points of North America—appear in the archaeological record alongside megafauna remains[2]. These tools were specifically designed for hunting large game, and their geographic distribution closely matches the range of megafaunal species[2].

As populations of these large animals declined, so did the use of FPP technology. By around 11,600 years ago, when megafauna were nearly extinct, hunter-gatherers broadened their diets to include more small- and medium-sized animals, and new types of projectile points emerged, reflecting a fundamental shift in subsistence strategies[2][3].

The Megafaunal Collapse and Human Response

The reasons for the sudden extinction of South American megafauna remain debated. While climate change at the end of the last glacial period undoubtedly played a role, recent studies highlight the significant impact of human predation[2]. The pattern is clear: as megafauna populations declined, so too did the specialized hunting cultures that depended on them.

This decline was not uniform across South America. In areas where megafauna remained abundant, such as open grassland steppes of the Pampas and Patagonia, humans continued to rely on them as primary food sources until their extinction[2][3]. Only after the virtual disappearance of megafauna did people turn to smaller animals and diversify their diets[1][3].

Debunking Old Myths

The idea that extinct megafauna were a marginal resource for early South American humans has been robustly refuted. Quantitative data now show that these animals were not only present in the landscape but were central to human subsistence[3]. This has significant implications for our understanding of both human prehistory and the causes of the late Pleistocene extinctions.

The dominance of megafauna in the archaeological record also explains why early South American hunters developed such specialized technologies and why their cultures changed so dramatically after the loss of these animals[2].

Legacies of the Lost Giants

The disappearance of South America’s megafauna marked a turning point in human history on the continent. The shift to smaller game and broader diets foreshadowed the complex societies that would later emerge. Yet, for thousands of years, megafauna were the undisputed meat of choice—the animals that shaped migration, technology, and culture.

Today, the story of South America’s first hunters and their giant prey stands as a powerful reminder of how deeply our ancestors’ fates were intertwined with the animals they pursued. As new studies continue to illuminate this relationship, we are forced to reconsider not only the causes of extinction but also the remarkable adaptability and ingenuity of early humans.

In sum, megafauna were not a peripheral resource—they were the backbone of early South American subsistence, the keystone of ancient hunting economies, and the meat of choice for the continent’s first peoples[1][2][3].

Original source: Ars Technica – Megafauna was the meat of choice for South American hunters