Hi Olaf,
Er, what was the question ...? Ah yes, pivot axle through hip joints ... well I assume that you included the picture of the unicycle in order to imply that this correlation might be important. And perhaps it is. But I don't think comparing with a unicycle is rewarding since it is a completely different breed than pythons.
I confess that I only added the unicycle picture to draw your attention ;-)
You are right, it is a different breed.
Greetings from Jürgen.
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