For me the film was a cross between Dances with Wolfs and Toy Story. Having said that I see others are taking deeper meanings from it.
Watch this 2 min YouTube link by a system theorist and educated man.
http://www.youtube.com/watch?v=nLw9MpAGkxg
Please make a point of watching 1 or 2 of his films in the links on the right.