Well if you have read the book's in the twilight series by Stephine Meyer you will know we have 24, werewolves have 25 (as does Renesme-Nessie) but vampires have 26. I have no idea what animals do...
The simple answer is 'yes' because back in time we all share a common evolutionary ancestor. However since this common ancestor evolution has changed the shapes and structure of bones. For instance...