chaseter
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It is ecologically a mass migration until they get to their habitat of choice in which they will colonize in it. They aren't going to colonize 1/3 of America, they will colonize in 1/3 of America....no?
That wording is so incredibly awkward. Again, given the context and the varying connotations of the word, it works. You're just thinking of it in unilateral terms.
Ecologically, it's a completely acceptable term for the situation.