Manny was questioned very well, when's the last time you saw another mammoth? So what if it didn't. There is always a dramatic conflict at the beginning of the story, if not, find one yourself.
The glacier melts, the end of the world, the hats on the animals' heads are getting bigger and bigger, it is better to find pine cones easily.
Since then, all the things along the way are mostly pure jokes. Without the touch of the first part, it may be more occasional knowing smiles.
The water comes inexplicably, the water recedes inexplicably, the ending of the story is a bit far-fetched.
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