Traditional paleo-anthropologists short-sightedly "reason" illogically like this: "Pan & Gorilla are African, quadrupedal & forest-dwelling, but Homo is bipedal outside the forest, "hence" we became BP when we left the forest for (in Africa!) the savanna"
.
Egocentric nonsense, of course (Lucy was a fossil relative of gorillas, but who prefers to find a gorilla ancestor rather than a human ancestor??):
- Plio-Pleistocene "hominin" fossils in Africa (although BP - but *all* early apes were "BP", google "aquarboreal") much more resemble Pan or Gorilla than Homo.
- Our Pliocene ancestors were not even in Africa (e.g. we lack Pliocene African retrovirus DNA, see Benveniste 1976, Yohn 2005) - most likely following S.Asian coasts.
- Early-Miocene Hominoidea ("apes") were already BP (in swamp forests, google "aquarboreal"), and not only humans but also gibbons & siamangs are still BP.
- Early Homo is found as far as Java (H.erectus) & even Flores (18 km oversea). - Etc.
We've always been waterside, never savanna, e.g. https://www.gondwanatalks.com/l/the-waterside-hypothesis-wading-led-to-upright-walking-in-early-humans/

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