There have been many changes of migration but the patterns have not changed.
due to migration there is no particular place.
migration and hibernation
Migration
Seasonal changes and food resources .
Migration to the west.
A sever drought forced many to migrate west.
A severe drought forced many to migrate west.
A severe drought forced many to migrate west.
the migration of americans from the rust belt to the sunbelt
yes
Yes
I am sure that over the years, sime have been changed, because new moves were invented, but I don't think that any rules have been changes lately.