Comment by estearum

And now we’ve come full circle to the uselessness of this label.

A species evolving in Area A and migrating to Area B is extremely common.

Camels, horses, marsupials, elephants, cats, opossums, New World monkeys, and even Homo sapiens all evolved in regions different than where they are found now.

Once they’re integrated into their ecosystems we just don’t refer to them as invasive. But calling something invasive or not doesn’t affect their ecosystem integration, causality works in reverse.

So the relevant question is, again, whether these have become critical to their now-local ecosystems.