TheintroductionofIceAge4THESTORYScratisacrossoverofasquirrel['skwirəl]松鼠andarat(hencethenameSc-rat),issmallandhasbrownishfur.Scratisjustcrazyaboutacornsandwilldoanythingtogetthem.ThemainprotagonistsManny:awoollymammothEllieEllie’ssparkypersonalityandlovingnaturemakeheraperfectmatchforManny.Hereasygoingnaturekeepsthegrouphappyandmostimportantlytogether.Ethanispopular,adventurous.AtfirstPeacheshasacrushonhimbutshefindsheismoreshallowthancool.DIEGOShira’sthebeautiful,agilesaber-toothtigerandmemberofGutt’screwbutshediscoversfamilyisreallyimportantinlife.Guttisthemainantagonistofthefourthfilm.Heisaself-styledmasterandpiratecaptainofthehighseas.Asahostileape,hehasabadtemperandbulliesotheranimals.