Usage note as noted in dictionary.com
Migrate, which is used of people and animals, sometimes implies a lack of
permanent settlement, especially as a result of seasonal or periodic
movement.
Emigrate and immigrate are used only of people and imply a permanent move,
generally across a political boundary. Emigrate describes the move relative
to the point of departure. As in:
"After the Nazis came to power in Germany, many scientists emigrated (that
is, left Germany)."
By contrast, immigrate describes the move relative to the destination. As
in:
"The promise of prosperity in the United States encouraged many people to
immigrate (that is, move to the United States)."
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