Watch Ice Age: A Mammoth Christmas

Christmas has come and Scrat eyes a beaver assembling a cache of foods, among them an acorn: Scrat sneaks in and takes the acorn, along with others he finds in the area set up as decorations: he ties a large stockpile of them on a piece of bark and tries to leave with them, but they break out and leave him with nothing. Meanwhile, Manny brings the Christmas Rock out of storage, to Ellie's delight: the rock is intended as a surprise for Peaches, who comes sliding down a snow slope in a snowball fight with Crash and Eddie. Manny reveals that the Christmas Rock is the same one from his childhood, a family heirloom, and important as it lets Santa Claus find them to deliver presents.