Skeleton - I'm going to dissect this cow anatomy from bone to flesh. Let's observe the skeleton of a basic generic cow. Notice how the bones of a cat aren't as complex as say a human. Though this isn't an exact replica of a cattle skeletal structure, it's a basic layout of what it generally looks like. The hip bone is the largest bone on the cow, which is why they have this sharp 'hump' at their rear. Also note that a cattle's bones are very dense to aid in their performance of running. It would be pretty helpful to use these diagrams for future reference if you'd want to 'zombifiy' a cow, or need a 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.