Rigidbody + Collider (Root or each GameObject)

I know there have been tonnes of threads discussing moving colliders and rigidbodies.

However, I want to know if you have a set of rigidbodies (for instance different body parts on a character, which move via animation) can I just have one isKinematic rigidbody at the root game object of the character or do I need a rigidbody component attached to each collider (i.e. capsule colliders for arms, torso, legs etc)?

Thanks, Alex.

 

Just the root object needs a rigidbody attached. http://docs.unity3d.com/Manual/class-Rigidbody.html see at the buttom "compound collider"

 

Thanks. Just out of curiosity would adding a kinematic rigidbody to each collider cause a lot of overhead? Or would it be negligible (lets say 10 rigidbodies vs just the root rigidbody).