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Searching for a safer habitat, the prehistoric Crood family discovers an idyllic, walled-in paradise that meets all of its needs. Unfortunately, they must also learn to live with the Bettermans -- a family that's a couple of steps above the Croods on the evolutionary ladder. As tensions between the new neighbors start to rise, a new threat soon propels both clans on an epic adventure that forces them to embrace their differences, draw strength from one another, and survive together.