During the evacuation, a glacier that contains two sea reptiles from the Mesozoic era, Cretaceous a Cymbospondylus and Maelstrom a Pliosauroidea, breaks off. When Manny is briefly separated from them, Diego and Sid encounter two mischievous opossums named Crash and Eddie who drive them nuts by playing Whac-A-Mole with them. Manny is still worried about being the last mammoth alive and his family, who had been killed by humans, but is surprised when he encounters Ellie, a female woolly mammoth who believes she is an opossum and Crash and Eddie’s adoptive sister. Sid invites her to tag along with the group to escape the flood, and she brings her brothers. After a dangerous encounter with Cretaceous and Maelstrom while crossing a pond, Sid prompts Diego to encourage him to admit and face his fears – Diego insists that “fear is for prey”, so Sid points out that Diego is behaving as if he is the water’s prey. They discover an area which Ellie recalls as the place where she was adopted. She finally realizes she is a mammoth and also expresses her suspicions about how different she was from other opossums. Despite this bonding moment with Manny, she distances herself from him when he suggests “saving their species”. Ellie and Manny ultimately make up when they must co-operate to save the group when the ground cracks under their feet. Sid is kidnapped by a tribe of mini-sloths who believe Sid to be a god. Sid lights a fire for them, and believes that he has finally found respect, but they plan to sacrifice him by tossing him into a volcano; Sid narrowly escapes. The next morning, Sid tells the others his experience but none are convinced. After being harassed by vultures, the group finds the boat behind a field of hot geysers, which separates Manny, Sid and Diego from Ellie and her brothers when they argue about which way’s safest to go through.