00:00There's one more scenario, and this is probably the most disruptive one.
00:05It's that bipedalism doesn't define hominins.
00:09The genetic estimate.
00:10That are often paired with paleontological evidence.
00:15It indicated that the common ancestor of humans and chimpanzees lived between six and eight.
00:20Million years ago.
00:21And so here we have a fossil that already has.
00:25What we think is a derived characteristic of hominins.
00:30If that's true, then hominins existed.
00:34The lineage had.
00:35The minority split from the lineage leading to pan, leading to chimpanzees, by seven million years ago.
00:40Which means the common ancestor has to perceive that.
00:43A second interpretation is...
00:45That no, we've been right on the common ancestor timing of six to eight.
00:50Million years ago.
00:51And if that's the case, then something that's...
00:55This bipedal at that time means that the common ancestor...
01:00Already was more bipedal than a chimpanzee.
01:03And that over time...
01:05Chimpanzees became less bipedal.
01:08There's one more scenario.
01:09And this is...
01:10Probably the most disruptive one.
01:12It's that bipedalism doesn't...
01:15Define hominins.
01:17And that you had bipedalism as...
01:20A form of locomotion in things that were not on the hominin lineage.
01:25So the question we now have as a field that we have to contend with is...
01:30Can you be bipedal?
01:31And not be hominins.
01:35And not be hominins.
01:36And not be hominins.
01:37And not be hominins.
01:38And not be hominins.
01:39And not be hominins.
01:40And not be hominins.
01:41And not be hominins.
01:42And not be hominins.
01:43And not be hominins.
01:44And not be hominins.
01:45And not be hominins.
01:46And not be hominins.
01:47And not be hominins.
01:48And not be hominins.
01:49And not be hominins.
01:50And not be hominins.
01:51And not be hominins.
01:52And not be hominins.
01:53And not be hominins.
01:54And not be hominins.
01:55And not be hominins.
01:56And not be hominins.
01:57And not be hominins.
01:58And not be hominins.
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