> after enough time
Correct. After a few tens of thousand years. On the way there, they cause the extinction of several species that cannot adapt fast enough, resulting in a much changed ecosystem than before them.
This isn’t great if
1. You don’t have a couple historic eras to wait stuff out
2. You *like* how stuff is right now and do *not like* how the newcomer is killing off all your favorite species in job lots.
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