Eli5 why is there a very small amount of biped species?
In: Biology
It’s because most bipeds require a lot of balance. Supporting this behavior is expensive in terms of both nerves and muscles. It’s a small niche for evolution and there aren’t many drivers to this body plan.
Causes back problems and you’re easily taken out by predators, unless you can out smart them.
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Birth! I won’t go much into it because I don’t know but the bipedal position requires a smaller pelvis whereas a quadruped can have a wider pelvis. This causes human babies to be born “earlier/ more underdeveloped” than quadruped babies – because smaller head circumference, easier to pass through the pelvic diameters. So the theory is that the bipedal position requires babies to be born earlier and therefore need more time to develop post natal.
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