Highlights

The genus Homo emerged approximately 2.8 to 3 million years ago in Africa, evolving from earlier australopithecine ancestors
Early species such as Homo habilis were among the first to use stone tools, marking the beginning of the Paleolithic era
Homo erectus became the first human species to migrate out of Africa, spreading across Asia and Europe over a million years ago
Homo sapiens appeared roughly 300,000 years ago and developed complex language, culture, art, and abstract thought
The genus Homo has since transformed the planet through agriculture, civilization, industry, and technology, becoming the dominant species on Earth

The genus Homo represents a lineage of bipedal, large-brained primates that emerged in Africa during the Late Pliocene epoch. The earliest recognized members, including Homo habilis, displayed a significant increase in brain size compared to prior hominins and demonstrated an ability to craft and use rudimentary stone tools. Over successive generations, natural selection favored greater cognitive capacity, social cooperation, and adaptability, giving rise to a succession of species including Homo ergaster, Homo erectus, Homo heidelbergensis, and the Neanderthals, among others.

Homo sapiens, the sole surviving species of this genus, developed behavioral modernity characterized by symbolic thinking, sophisticated toolmaking, and organized societies. Following the agricultural revolution around 10,000 BCE, human populations grew rapidly and formed permanent settlements, eventually producing the civilizations, empires, religions, sciences, and technologies that define recorded history. By the modern era, Homo sapiens has fundamentally reshaped Earth's ecosystems, climate, and biological diversity, representing an unparalleled force of planetary change across geological and historical timescales.