This trait is correlated with an increase in the bicondylar angle.
This trait is correlated with an increase in the bicondylar angle. This adaptation is enabled by the anterior positioning of the foramen magnum at the center of the skull's base, and the shift away from an abducted hallux also facilitates it. The current accepted consensus is that large cranial capacity developed after this trait, facilitated by the three major spinal curves and earliest found in genera like Ardipithecus. Evidence for this trait in Australopithecus afarensis is provided by the Laetoli Footprints, and chimps use knuckle-walking instead of this trait. Seen after babies stop crawling, this is, for 10 points, what evolutionary trait which allows humans to stand and walk upright?
This trait is correlated with an increase in the bicondylar angle.
habitual bipedalism [or obligate bipedalism; or bipedality; or being a biped; or walking on two legs; accept equivalents; accept walking upright until mentioned; prompt on "walking" until "walk"] 