To many bones in rigging model?

I dl a model and there’s a couple of bones in the air connected to the rig. What are those for?

you talk about the two bones in front of the knees ?
They are probably not useful right away, but they are used in IK chains to do easier posing of the character…

You might look at tutorials on building IK chains for rigs to understand better !

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Many thanx for help!