After Sid (John Leguizamo) pilfers some dinosaur eggs, Manny (Ray Romano), Diego (Denis Leary) and the rest of their prehistoric pals enter a mysterious, underground world to rescue the hapless sloth.

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You might know the Cretaceous Period for big animals such as Tyrannosaurus rex and Triceratops, or for being the end of the age of dinosaurs. But what was the world like in the millions of years ...