The Human LineLife & Evolution Lucy (Australopithecus afarensis) 3.2 million years agoMajor The famous skeleton from Ethiopia shows a small-brained ancestor that walked fully upright. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → Lucy (Australopithecus afarensis) Community notesLoading notes… Learn more ranked by votesDocumenthumanorigins.si.eduAustralopithecus afarensis (Smithsonian Human Origins) ↗Editor's pickBookDonald Johanson and Maitland EdeyLucy: The Beginnings of Humankind ↗Editor's pickBookDonald Johanson and Kate WongLucy's Legacy ↗Editor's pickVideoSearch on YouTubeLucy Australopithecus afarensis discovery ↗Editor's pick