10. Characteristics of H. ergaster

Homo ergaster was the probable ancestor of the later homo populations. It emerged in early African populations nearly 1.9 million years ago. H. ergaster had a prominent browridge, a rounded skull, and its teeth were very small, especially when it was compared to the teeth of Australopithecus. One of the major discoveries of a H. ergaster was the Nariokotome Boy. His facial features included thick bony ridges across his eyes, buck teeth sticking out of his protruding mouth, and a long, wide nose.

Anyways, H. ergaster's body was probably smooth, nearly hairless, and was one of the first hominids to regulate its body temperature by sweating. Its skin would have also been most likely dark to protect it from the Sun's rays. H. ergaster traveled mostly on foot, searching for meat to feed its growing brain and body. To be able to conserve energy in his muscles while walking upright, H. ergaster developed a narrower pelvis. Because of this tighter pelvis, it cause the lower part of the ribs to narrow, while the upper part of the ergaster's rib cage expanded, giving its chest a more barrel shape. Also due to this tight pelvis, baby H. ergasters were born immature in the brain, allowing its brain to grow after it has been born. This proved a disadvantage because Homo ergasters were nearly helpless for the first year of its life. Nearly 1.6 million years ago, with help from this giant, complex brain, H. ergasters began using Oldowan stone tools and heart shaped handaxes. Overall, H. ergaster evolved a lot from the earlier hominids, and it later will evolve into a more sophisticated organism.

Average Height: 6 feet and 1 inch

Important Discoveries: discovery of Nariokotome Boy

Source(s):

-[1]

-Lab Manual pg.23

Image(s):

-[2]

-[3]

-Alexander Kim

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