How Did Homo ergaster Survive for Around 500,000 Years in Africa, and Why Did They Eventually Go Extinct? — Here’s What Scientists Discovered

The modern human species existed around 300,000 years ago in Africa, but before us, there were already a lot of other hominins that lived and thrived on the continent. One of these homo species is Homo ergaster. They are an extinct archaic humans that were estimated to have lived around 1.9 million to 1.4 million years ago. This meant that they could have survived in the harsh and ever-changing environment on Earth for roughly 500,000 years.

In other words, they are a human species that existed far longer than Homo sapiens, but what exactly made them successful, and what could have caused their downfall? Their fossils and environmental studies left some clues, so in this article, let’s dive deep into the past and imagine the world they lived in.

How They Survived — Anatomy, Diet, and Mobility

Before discussing how Homo ergaster could have survived, it is important to acknowledge that some researchers think of this species as just the African part of Homo erectus, while others believe they are a completely different species. This is still an ongoing scientific debate, and further research is needed to understand them even deeper.

With that said, Homo ergaster, compared to other earlier humans, was thought to have more modern-like body proportions. This is probably one of the most significant reasons why they existed for so long, because it meant that they had longer legs and more refined bipedalism that allowed them to travel long distances and cover a wide range of territories to able to gather resources.

Because of these traits, they may have developed a more diverse diet that included plant foods like underground roots and fruits, but also meat from scavenged and hunted animals. Over time, these diets and adaptations could have led them to have bigger brains than their ancestors and other hominins in the area, like Homo rudolfensis and Homo habilis.

Then these bigger brains, which are still smaller than modern humans, may have given them better cognitive abilities utilized for hunting, making tools, and surviving environmental challenges.

Read more: Wikipedia

Tools, Technology, and Social Behavior

Homo ergaster: The Workman | How Homo Ergaster Shaped Our World | Human Evolution

One of the key strengths of Homo ergaster was their tool-making. They are associated with the Acheulean tools, which produced more sophisticated hand axes that could have been used to make an even better hunting arsenal, like a spear. Furthermore, a simple version of this tool, which would be a sharpened wood or stick, was observed to be used by chimpanzees in the wild. So, it could be plausible that earlier hominins may have utilized them too, especially after developing hand axes.

These are the tools that they may have used to hunt and scavenge meat. They likely processed the meat and cut through it to get more out of it, and even obtained the marrow inside. With these enhanced and sharpened tools, fewer calories are wasted, and more nutrition can be accessed.

They may have also developed a more defined social structure. With tool use, it means there is less pressure on one individual. They could have hunted together and gathered more resources, as they would be able to cut through tougher plant materials.

A larger group is also safer against predators and more resilient against biological diseases, as it would have allowed them to have a healthier gene pool. However, despite these adaptations, there are still factors that affect their survival that are out of their control.

Challenges and Pressures — Climate Change, Competition, and Habitat Loss

The combination of anatomy, tool use, and cooperation made Homo ergaster able to survive in the harsh environment in Africa nearly 1.8 million years ago. However, survival for hundreds of thousands of years does not mean that they would survive for even longer. Soon, they faced hardships and environmental pressures that they would not be able to overcome.

One of the most significant pressures, not only for Homo ergaster but for all other hominins, was climate change. This phenomenon resulted in the shifting of the environment and natural habitats where homo genus species adapted and thrived. Forested areas receded, open grasslands and savannas expanded, and rainfall patterns fluctuated. These are changes that could have caused their resources to be scarce, and even make some livable habitats shrink.

With climate change doing damage to the environment, hominins were forced to compete for whatever livable habitat remained. This meant that older and less advanced hominins were likely to be outcompeted and eradicated. Then the new lineages that emerged could have displaced or replaced the older ones.

Read more: BioMed Central

Why They Disappeared — Extinction Scenarios

Homo Ergaster Explained

There are several extinction scenarios that scientists could infer from Homo ergaster’s fossils and environmental data during their existence. But the main point was that their extinction was due to multiple factors that created a perfect storm instead of just one reason.

First was the environmental changes to their natural habitats, which were likely caused by climate change. The habitable areas that were probably once brimming with resources became scarce, and despite their mixed diets, the availability of food sources most likely dwindled.

This led to even more environmental pressure as it means the other hominins in the area may have needed to compete for the same resources and territories. This is why the second factor for their disappearance is likely due to competition. Homo ergaster was more advanced than the other older hominins, like Homo habilis and Homo rudolfensis. However, there are even better adapted species than them, such as Homo erectus.

Homo ergaster may also have been forced to be fragmented and live in smaller groups due to both climate change and competition. If these led to their isolation, then the risk of inbreeding increases. It also meant that each smaller group would have a less diverse genetic pool, which would make them vulnerable to a disease outbreak or be totally wiped out by habitat loss.

These are the main reasons why Homo ergaster could have gone extinct, and they are made up of a multitude of factors that would prove to be difficult to overcome, even for a human species that already has a modern-like body, tool-making abilities, and better social structures. Ultimately, the combination of increasing climate and environmental instability, and the competition with even more adaptable and innovative human lineages led to their eventual extinction.

Author's Final Thoughts

Homo ergaster was also one of the earliest hominins to be able to spread throughout the world. They were thought to have migrated out of Africa into Europe and Asia, or at least their lineages, like Homo erectus. These accomplishments, plus their existence for nearly 500,000 years, are a testament to their success as a species.

However, even the most successful and resilient species could face extinction and replacement when changes happened too fast or too fiercely before they could even adapt. The disappearance of Homo ergaster reminds us that being adaptable, being flexible, and cooperating are all important, but even then, they could not be enough.

Read next: How Did Homo rudolfensis Survive in East Africa Nearly 2 Million Years Ago, and Why Did They Eventually Go Extinct? — Here’s What Experts Believe

References & Further Reading

Antón, S. C., Potts, R., & Aiello, L. C. (2014). Evolution of early Homo: An integrated biological perspective. Science. https://doi.org/10.1126/science.1236828

Lepre, C. J., et al. (2011). An earlier origin for the Acheulian. Nature. https://doi.org/10.1038/nature10372

Berna, F., et al. (2012). Microstratigraphic evidence of in situ fire in the Acheulean strata of Wonderwerk Cave, Northern Cape province, South Africa. Proceedings of the National Academy of Sciences (PNAS). https://doi.org/10.1073/pnas.1117620109

Brown, F., Harris, J., Leakey, R., & Walker, A. (1985). Early Homo erectus skeleton from west Lake Turkana, Kenya. Nature. https://doi.org/10.1038/316788a0

Maslin, M. A., et al. (2014). East African climate pulses and early human evolution. Quaternary Science Reviews. https://doi.org/10.1016/j.quascirev.2014.06.012