Yea I hate just to walk by and leave them.That is a older shot.It just keeps growing. The gator teeth and wild boar tusk and quite a few more are missing in that shot.Here is a sight on some bison teeth though that might help.This is just one I had in favorites.Just type bison,cow,horse there are a lot out there (sites).They (bison) did roam up and down the east coast.The skull was dated 20,000 To 250,000 years old. http://www.anythinganywhere.com/commerce/naturalobj/bison.htm