Joe Rogan Experience #1561 - Kermit Pattison

At 4.4 million years old, Ardi predates Lucy by about 1.2 million years and includes a skull, hands, and feet—an extraordinary level of completeness for such an ancient fossil, giving scientists an unprecedented anatomical snapshot.

The skeleton shows bipedal adaptations (longer legs than arms, upright posture) alongside a grasping toe, indicating a primate that split time between walking upright on the ground and climbing in trees, unlike any living ape.

Anatomists find neither functional knuckle-walking features nor residual traces of such ancestry in Ardi’s anatomy, directly challenging the prevailing idea that humans evolved from a knuckle-walking, chimp-like ancestor.

Ardi’s canines are larger than humans’ but much smaller and less aggressive-looking than those of chimps and gorillas, supporting hypotheses that reduced male–male aggression and some form of pair-bonding or provisioning may have begun very early.

One influential (and controversial) theory argues that standing upright freed males’ hands for provisioning mates and offspring, boosting child survival, even though bipedalism is biomechanically “costly” and exposes the skeleton to new stresses.