---
lang: en
type: Hominin
record_kind: entity-profile
title: Ardipithecus ramidus
description: "Ardipithecus ramidus is an early hominin species that lived approximately 4.4 million years ago in what is now Ethiopia. Known from the famous partial skeleton 'Ardi', this species displays a mosaic of ape-like and human-like features, including adaptations for both tree-climbing and upright walking, challenging previous theories about the origins of bipedalism."
llms_summary: "Ardipithecus ramidus. (Aramis, Afar Region, Ethiopia). Hominin. Associated Tools None. Chronological Range 4.4 Mya. Cranial Capacity 300 cc. Estimated Stature 1.2 m. Evolutionary Group Early Hominin. Extinction Context Extinction likely due to environmental change and/or competition from emerging Australopithecus species.  Type Specimen ARA-VP-6/500 (Ardi). Year Discovered 1992. Paleoanthropology. Ardipithecus ramidus is an early hominin species that lived approximately 4.4 million years ago in what is now Ethiopia. Known from the famous partial skeleton 'Ardi', this species displays a mosaic of ape-like and human-like features, including adaptations for both tree-climbing and upright walking, challenging previous theories about the origins of bipedalism.  canonical profile on Chrisyst Datasets"
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slug: ardipithecus-ramidus
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indexed_at: "2026-07-16T13:15:13.715Z"
license: citation-free
entities:
  -
    role: subject
    slug: ardipithecus-ramidus
    name: Ardipithecus ramidus
    type: Hominin
    profile_url: "https://datasets.chrisyst.com/ardipithecus-ramidus/index.md"
    same_as:
      - "https://www.wikidata.org/wiki/Q105948"
---
# Ardipithecus ramidus

Ardipithecus ramidus is an early hominin species that lived approximately 4.4 million years ago in what is now Ethiopia. Known from the famous partial skeleton 'Ardi', this species displays a mosaic of ape-like and human-like features, including adaptations for both tree-climbing and upright walking, challenging previous theories about the origins of bipedalism.

## Record

- **Title**: [Ardipithecus ramidus](https://datasets.chrisyst.com/ardipithecus-ramidus/index.md)
- **Geo target**: Aramis, Afar Region, Ethiopia
- **Website**: http://www.ethiopianmuseums.gov.et/
- **Phone**: +251 11 122 3719
- **Email**: info@ethiopianmuseums.gov.et
- **Address**: King George VI St, Addis Ababa, Addis Ababa, 1000, Ethiopia
- **Coordinates**: 9.022736, 38.746799

### Summary

Ardipithecus ramidus is an early hominin species that lived approximately 4.4 million years ago in what is now Ethiopia. Known from the famous partial skeleton 'Ardi', this species displays a mosaic of ape-like and human-like features, including adaptations for both tree-climbing and upright walking, challenging previous theories about the origins of bipedalism.

### Description

## A Mosaic of Traits
*Ardipithecus ramidus* represents a pivotal, early stage of human evolution, with the first fossils discovered in 1992 at Aramis in the Middle Awash region of Ethiopia by a team led by Tim White. The most significant find, the partial skeleton ARA-VP-6/500 nicknamed "Ardi," revealed a surprising mosaic of primitive and derived characteristics. While its pelvis and lower limbs show adaptations for facultative bipedalism on the ground, its feet retained a divergent, grasping big toe (hallux), indicating significant time spent climbing in trees. This combination challenges earlier models that posited a savanna-driven origin for upright walking. Its skull, with a small cranial capacity of 300-350 cc, housed a brain similar in size to a female chimpanzee's, but its facial projection was less pronounced than in modern apes.

The paleoecological context of *Ar. ramidus* is as revolutionary as its anatomy. Fossil evidence indicates it inhabited a woodland environment, not the open savanna biome long hypothesized as the cradle of bipedalism. This finding forced a major re-evaluation of the selective pressures that led to upright walking. The species' diet, inferred from its relatively small molars and thin enamel, likely consisted of fruits, nuts, and other forest foods, contrasting with the tougher, more abrasive diet of many later australopithecines. Furthermore, the reduced size of the male canines and the lack of a canine-premolar honing complex suggest a social structure with diminished male-to-male aggression, potentially pointing towards different mating and social systems than those seen in chimpanzees.

### Attributes

- **Associated Tools**: None
- **Chronological Range**: 4.4 Mya
- **Cranial Capacity**: 300 cc _(quality 325)_
- **Estimated Stature**: 1.2 m _(quality 1)_
- **Evolutionary Group**: Early Hominin
- **Extinction Context**: Extinction likely due to environmental change and/or competition from emerging Australopithecus species.
- **Type Specimen**: ARA-VP-6/500 (Ardi)
- **Year Discovered**: 1992 _(quality 1992)_