![]() Scientists had long thought that one set of unusual prints there was left by a bear walking on its hind legs, but a new analysis published in the journal Nature suggests that's not right. Fossil footprints in Tanzania reveal that two human species once lived in the same place at the same time. ![]() ![]() The early humans who walked the Earth nearly 3.7 million years ago were not walking alone. On the right is the rear footprint of a young black bear. On the left is a nearly 3.7 million-year-old fossil footprint now believed to have been made by an early human.
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