Anthropologists have used the skeletal remains of our ancestors to fill in the missing gaps between modern humans and chimpanzees. Contrary to the common theory, and using new evidence from a species of 4.4 million-year old human ancestor called Ardipithecus ramidus, scientists now know that early humans began walking in forested environments rather than on savannah plains. Ardi is a controversial discovery, and since they grew to only four feet tall, some scientists believe the species was more of an extinct lineage of ape, rather than a true human ancestor.
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