We are introducing extensions to the standard Second Life Avatar Skeleton that give you dozens of new bones to support both rigging and animation, and accompanying new attachment points! This extended skeleton, which is fully backward compatible with existing avatars, rigging and animation, gives creators the power to create more sophisticated avatars than ever before. The skeleton extensions include:
11 extra limb bones for wings, which could also be used for additional arms, or extra legs.
6 tail bones
30 bones in the hands
30 bones for facial expressions
2 other new bones in the head for animating ears or antennae
13 new attachment points associated with the new bones