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3, ice age 1 ice age 2 and ice age dawn of the dinos.
Since i don't know which one you mean, I will give you all of the ice age movies.
1. Ice age
2. Ice age 2 The Meltdown
3. Ice age 3, Dawn of the Dinosaurs
4. Ice age 4, continental Drift
Hope this helps!
no 1.
1. Animals didn't really talk in the ice age. 2. There probably wasn't actually an underground world with tropical plants and dinosaurs.