Homo erectus

Homo erectus was a highly successful species of archaic human. They lived during the Pleistocene epoch for nearly two million years.

This species was the first to evolve a humanlike body plan and gait. They were also the first humans to leave Africa to colonize Asia and Europe.

Some populations of Homo erectus were ancestors of later species. They may have led to Homo heidelbergensis, the last common ancestor of modern humans, Neanderthals, and Denisovans. Because they lived in so many places for so long, their anatomy varied quite a bit.

Scientists have used different names to describe various groups of Homo erectus. Some researchers recognize several subspecies to show where and when they lived. These include H. e. erectus from Indonesia and H. e. pekinensis from China. Other groups include H. e. soloensis, H. e. ergaster, H. e. georgicus, and H. e. tautavelensis.

While these names help organize fossils, many scientists view these differences as clines. A cline is a gradual change in physical traits across a geographic area. This means they were likely one large, connected species rather than totally separate groups.

The discovery of Homo erectus changed how we understand human history. In 1893, Eugène Dubois described the species using fossils from Java, Indonesia.

He found a skullcap, a molar, and a femur, which he called "Pithecanthropus erectus." At first, many scientists dismissed his findings. Later, anatomist Franz Weidenreich noticed similarities between these fossils and "Peking Man" from China.

This led to a debate about where humans began. Some believed in polycentrism, the idea that humans evolved in different places. However, the "Out of Africa" theory and monogenism became the scientific consensus. This theory states that all modern humans share a single common ancestor from Africa.

Physically, Homo erectus looked quite different from modern humans. Their skulls typically featured a pronounced brow ridge, known as a supraorbital torus. They also had protruding jaws and large teeth.

Their bones were much thicker and more robust than ours. Reconstructed adult heights ranged from about 3 feet 7 inches to 5 feet 9 inches. Their brain volumes also varied by region. East Asian populations often had larger brain volumes than Western populations. Some groups, like H. e. georgicus, had brain volumes that were quite low.

Homo erectus was also a very skilled survivor. They invented the Acheulean tool industry, which focused on large, heavy-duty stone tools.

These tools were likely used for butchery and processing vegetables. They may have also used them for woodworking to make spears or digging sticks. This technology helped them become major predators of large herbivores. They lived on expanding savannas during the Quaternary glaciation. They are often characterized as the first hunter-gatherers and the first to use sexual division of labor.

Their ability to move across the world was a major achievement. This dispersal was likely driven by bipedalism, better technology, and a carnivorous diet.

They traveled through open grasslands and woodland savannas. These habitats expanded because of a global drying trend. While they were the first to wield fire, some scientists believe fire and cave living were not central to their daily lives. They may not have lived in very cold regions or cooked their meat often. Their massive range shows how adaptable the species was to different environments.

Even though they were widespread, the species eventually declined. The last known occurrence of Homo erectus was in Southeast Asia. This was between 108,000 and 117,000 years ago.

This specific population, H. e. soloensis, likely disappeared when the savannas turned into thick tropical jungles. This change in the environment removed the habitats they relied on. By studying these fossils, we can trace the long, complex path that led to the arrival of modern humans.