To migrate is to move ones home or place of living from one region or country to another.
When birds fly South for the winter it is called migration.
The birds flew South for their migration in the Winter.
A migration.
If what you really mean is, "How does the suffix -tion change the meaning of the base word migrate in the word migration, then I have an answer. -tion is "the act of", and instead of "The birds migrate.", as a verb, it turns into "The birds migration is very long.", and it's a noun.
E.P Ramsay has written: 'Notices on the migration of birds in Australia' -- subject(s): Birds, Migration
Differential migration is simply a phenomenon especially found in birds where different sexes of birds migrate different distances.
Janice M. Hughes has written: 'The migration of birds' -- subject(s): Migration, Oiseaux, Birds
flying with birds
Phenology
6000000...0000000milllion trillion birds
use it as the first word e.g. migration is what birds do to survive
the massive migration has begun. Birds also show migration to survive.