they are ambushed by Rudy. Working together, Manny, Sid, Diego, and Buck manage to trap Rudy by ensnaring him in vines. However, he quickly breaks free and resumes his onslaught. The herd is saved by Momma, who charges at Rudy and knocks him off a cliff, where he falls to his presumed death. Sid then says goodbye to the dinosaurs, while Momma acknowledges him as their father figure. Having realized that Momma is their real mother, the babies follow her as she leaves. Buck, now without a purpose in life since Rudy is gone, decides to join the herd and live on the surface. However, a distant roar tells him that Rudy is still alive. Because of this, he changes his mind and sends the herd home, blocking off the path to the underground jungle. Manny and Ellie welcome Peaches into their frozen world and Manny admits to Sid that he was a good father to the baby dinosaurs. Diego decides to remain with the herd, while Buck stays underground, happily battling with Rudy. Meanwhile, Scrat and Scratte decide to live in the jungle together. However, Scrat ultimately chooses the acorn over her. The two battle once more for the acorn, which results in Scrat being accidentally launched back to the surface while Scratte falls back in the dinosaur world, making it her new home. Scrat taunts her about the acorn, but once again loses it after a large piece of ice knocks it out of his hands, much to his frustration. Cast Ray Romano as Manny, a woolly mammoth and the leader of The Herd. He is also Ellie's husband, Sid and Diego's best friend and Peaches' father. John Leguizamo as Sid, a ground sloth and the founder of The Herd. He is also Manny and Diego's best friend and the adoptive father of the three baby dinos. Denis Leary as Diego, a Smilodon and a member of The Herd and Manny and Sid's best friend. Simon Pegg as Buck, a one-eyed least weasel and a dinosaur hunter who joins The Herd. Queen Latifah as Ellie, a female woolly mammoth, Manny's wife, Peaches' mother and Crash and Eddie's foster sister. Seann William Scott as Crash, an opossum, Eddie's biological brother and Ellie's foster brother. Josh Peck as Eddie, an opossum, Crash's biological brother and Ellie's foster brother. Tara Strong as Peaches, Manny and Ellie's first child. Chris Wedge as