Hi.
Can a 3D model have more than one Skeleton?
Yes, an asset can hold multiple skinned meshes with separate skeletons.
Do you mind giving more context to your question? Why are you asking?
It’s ok I have dropped the idea, I wanted to add some type of markers inside the skeleton bones and move but it is stupid because the user can’t hover on them while the model is animating, he has to hunt them literally the more aggressive the movement is the harder is to hover them so is not a solution… a few days wasted and a few new thins that I learned 
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Its no waste of time if you learned something by doing it.
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That’s true!