But that's only the beginning of his frustrations: Manny has been roped by Sid into helping reunite an abandoned human baby named Roshan with his family.
When Sid "adopts" Manfred as his protector, the mammoth tries everything he can to unload his newfound baggage. The exceptions are a woolly mammoth named Manfred, a high plains drifter who does things his own way and a terminally lazy sloth named Sid, who enjoys doing nothing, his own way. To avoid a really bad frostbite, the planet's majestic creatures - and a few small, slothful ones - begin migrating south. The Earth is a wondrous, prehistoric world filled with danger, not the least of which is the beginning of the Ice Age.