Abstract: The present invention relates to a kind of rail track toy comprising a relatively large self-driven predator that blows a current of air and a relatively small prey driven by the propulsion of the air current, in which the predator is provided with a mechanism which temporarily intercepts said air current in cooperation with the synchronous closure of the previously widely opened mouth of the predator to hold the prey therein, and after a transient interval, stop intercepting said air flow in response to the opening of the mouth to push said prey out to continue the game of chase-and-run.