A new trailer is here for Ice Age: Dawn of the Dinosaurs. The cast of prehistoric clowns are all back: Manny, Sid, Diego and Ellie. But this time around they discover some neighbors they never even knew were living next door -- the dinosaurs. They're big and fearsome, but it doesn't keep the gang from finding new ways to goof off. Think of this sequel as a kind of Jurassic Park 4. For kids. Check it out after the jump.