During an attack on a pack of Iguanodon, an egg is separated and ends up with the possession of a group of lemurs. The lemurs care for this egg and the young creature born from it, which they call Aladar. When a meteor shower hits earth, Aladar and his family must leave their homeland. Away from home and as close to danger as they have ever been, they meet up with a huge group of dinosaurs, led by Kron and Bruton. All together they are trying to reach the nesting grounds, but it's not going to be easy.
Written by simon
The plot hole pointed out by some as to why the Herd went to have their babies in the Nesting Grounds but didn't remain there (hence the desert exodus) was explained in the "Essential Guide" of the film: the land in the Nesting Grounds becomes too cold and infertile in the winter, driving the Herd to leave it and return when they begin to breed.
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Goofs
Factual errors:
There are many other inconsistencies between the fictional representation of dinosaurs in the movie and accepted scientific knowledge at the time the movie was made. It should, perhaps, be remembered that it's family entertainment, not a documentary.
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Quotes
[first lines]
Plio:
Some things start out big, and some things start out small, very small. But sometimes the smallest thing can make the biggest changes of all. See more »