Life › Human evolution
The genus Homo
c. 2.8 million years ago· Organism or group· Human ancestors & us
Strong evidenceGood evidence; dates or details still being refined.
The human genus, which appeared in Africa about 2.8 million years ago and includes us and many extinct species.
See it on the Life map →What happened
The oldest fossil assigned to Homo is a jaw from Ledi-Geraru, Ethiopia, about 2.8 million years old. Compared with australopiths, Homo species generally had larger brains, smaller teeth and jaws, more reliance on tools and meat and, from Homo erectus on, long legs for walking and running. Roughly a dozen species and groups are recognized, including habilis, erectus, Neanderthals, Denisovans, floresiensis, naledi and sapiens. For most of this time several lived at once; now only we remain.
Why it matters
Homo's bigger brains, tools and wide travels set the stage for our own species, which went on to reshape the planet.
The evidence (fossils, genes, rocks)
Fossils from Africa, Asia and Europe, dated mainly by volcanic ash layers, plus stone tools and, for the last few hundred thousand years, ancient DNA and proteins.
Still debated
Which features define Homo, which species belong in it, and which australopith was its ancestor are all debated.
Inside this (9)
Connections (3)
▸Australopithecus probably gave rise to The genus HomoStrong evidence
The connection
Homo appears about 2.8 million years ago, while australopiths were still widespread. A jaw from Ledi-Geraru, Ethiopia, mixes australopith and Homo traits, suggesting that one australopith population, perhaps A. afarensis or a relative, evolved smaller teeth, bigger brains and greater reliance on tools.
When and how
East Africa, about 3–2.5 million years ago; the Ledi-Geraru jaw (LD 350-1), about 2.8 million years old, was found in 2013 and published in 2015.
How sure are we?
Fossils of intermediate form and their timing support the link, but the fossil record between 3 and 2.5 million years ago is thin.
Debates and open questions
Which australopith was the ancestor is debated: A. afarensis in East Africa, A. africanus or A. sediba in South Africa, or a species not yet found.
▸First stone tools became the hallmark of The genus HomoStrong evidence
The connection
From about 2.6 million years ago, Oldowan tools spread across East Africa, often near early Homo fossils. Making and using tools became central to Homo's way of life, from butchering carcasses to shaping handaxes, and many scientists treat toolmaking as part of what sets Homo apart.
When and how
East African sites from about 2.6 million years ago; Ledi-Geraru, Ethiopia, has both early Homo (2.8 million years) and early Oldowan tools (2.58 million).
How sure are we?
Tools and Homo fossils overlap in time and place, and Homo's later tool traditions are clear. The early overlaps are correlations, not proof of who made them.
Debates and open questions
Lomekwi tools at 3.3 million years, and Paranthropus teeth found with tools at Nyayanga, Kenya, suggest toolmaking was not unique to Homo.
▸The genus Homo led eventually to Homo sapiensWell established
The connection
Over about 2.5 million years, the Homo lineage grew bigger brains, used more complex tools and spread out of Africa repeatedly. Many Homo species coexisted; Homo sapiens arose from one African branch around 300,000 years ago and is now the only survivor.
When and how
Africa, from about 2.8 million to 300,000 years ago, with side branches across Eurasia and Indonesia.
The evidence
Fossils show the long trend in brain size and body shape; ancient and modern DNA trace our ancestry back to African populations.
Debates and open questions
The exact sequence of ancestors is debated. Our line looks less like a single trunk than a braided stream, with populations splitting and rejoining.