Bone Layers

Bone layers are similar to Group layers - they can both group together multiple layers that can then be manipulated as a single object. However, bone layers have an additional feature: In a bone layer, you can set up a skeleton that can be used to manipulate your artwork. A skeleton is exactly what it sounds like - an internal structure that can move the outer, visible portion of your artwork.

There are two editing modes available for bone layers: Bone, and Animation.