Just because scientists give dates to these findings, don’t be fooled into thinking the evolution of humans is completely understood.
Who knows what may still lie buried in Earth’s crust and from when? Also, the appearance of a new species doesn’t mean that the previous one had already died out.
It is believed, for example, that Homo habilis and Homo erectus lived side-by-side each other, along with Australopithecus.
Australopithecus afarensis is about 3 million years old, and is the scientific name for the fossil scientists call Lucy.
Homo habilis means “handy man.” Homo habilis used simple stone tools.
Homo erectus, a more advanced hominid than Homo habilis, appeared 1.5 million years ago.