Por mil huesecillos, c?mo pesa el brontosaurio!

"Geronimo Stilton's ancient ancestor Geronimo Stiltonut is back in another prehistoric adventure! It's the annual cavemouse sports competition! This year, Tiger Khan and his saber-toothed henchmen want to enter the games. They call a truce with the cavemice during the tournament...but when their flag goes missing, Tiger Khan is furious. Can Geronimo Stiltonut track it down in time to keep his fur intact?"--From publisher's web site.