Board Thread:Fossil Fuels/@comment-28675190-20160906191854

There is evidence suggesting it had a third claw from specimen "Pex Rex" but this third claw is small and more like a piece of bone that just protruded from its arm. It is also small so it could easily be lost when the skeleton was being excavated. So what would it be used for and why? Or is "Pex Rex" simply was a mutant? 