Skeleton - I'm going to dissect this bear anatomy from bone to flesh. Let's observe the skeleton of a basic generic bear. Notice how the bones of a bear aren't as complex as say a human, yet they have a back-leg that resembles a human's foot/leg. Though this isn't an exact replica of a Ursidae skeletal structure, it's a basic layout of what it generally looks like. The shoulder bone is the largest bone on the bear (depending on the species). Also note that a bear's bones are very dense to aid in their performance of climbing/running. It would be pretty helpful to use these diagrams for future reference if you'd want to 'zombifiy' a bear, or need a Ursidae skeletal reference for a gory scene. Whatever the use, study various poses and angles of these creatures in a skeletal format (which may be difficult since Google is rather limited with things such as that). Having a wide variety of references is crucial for a successful artist's palette.