Bones are like souls--they only show through sometimes, but it's always at really important junctures.
The tany below is a marvelous work in real life--I spent a good 30 min studying it and whoever sculpted knew his anatomy...very, very well. He didn't have tension and relaxation down, but mass, volume, and twisting where all there. I was looking at a real dinosaur.
These were drawn sometime last summer...along with 3-4 (or more) other sketchbooks of this stuff.
If you're wondering eremotherium is Science for "giant sloth." I had a great joke about what it really means, but am exercising my right to discretion...*sigh* ...it was really funny, but alas, also terribly inappropriate...