why did Polynesians migrate?

Answer 1

You have to be kidding? Why? We really don't even understand which direction they migrated from, nor the route.

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This so reminds me of the why did the chicken cross the road questions.

Answer 2

Also check these sites for some very interesting theories.

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http://www.paulwaters.com/migrate.htm

http://www.experiencefestival.com/human_migration_-_polynesian_migration

http://en.wikipedia.org/wiki/Polynesia

http://polynesianlineage.tripod.com/