As with the second Ice Age movie the third Ice Age movie is being introduced to us with a new Scrat short where the hapless yet determined saber-toothed squirrel goes to great lengths to retrieve an acorn with his adventures leading him into the larger story of the feature film. Watch the teaser trailer/short now at Apple Trailers. Ice Age 3: Dawn Of The Dinosaurs will premiere in theaters on July 4, 2009.