Scrat 1: http://www.youtube.com/watch?v=rhskSbh6EbA
Scrat 2: http://www.youtube.com/watch?v=W4gvxUlGNAs
“Old-style” Trailer: http://www.youtube.com/watch?v=Lb4vUDK6vQ4
I like their concept where the giant mammoth meets the dinosaurs, and discovers he is puny.