Rigs that are compatible with Mecanim should follow this hierarchy: Root |_Hip |_Upper Leg Left | |_Lower Leg Left | |_Foot Left | |_Toe Left |_Upper Leg Right | |_Lower Leg Right | |_Foot Right | |_Toe Right |_Spine |_Chest |_Upper Arm Left | |_Lower Arm Left | |_Hand Left |_Upper Arm Right | |_Lower Arm Right | |_Hand Right |_Neck |_Head