It is migrating.
Migration is not a verb so it doesn't have a present participle, it is a noun.The verb is migrate. To make the present participle form of any verb add -ing.migrate -- migrating. (You need to watch the spelling).
Getting is the present participle of get.
The present participle is doing.
Being is the present participle. The past participle is been.
Presenting is the present participle of present.
Presenting is the present participle of present.
The present participle is choosing.
The present participle is walking.
The present participle is cleaning.
The present participle is leading.
The present participle of "understand" is "understanding."
The present participle is swearing.