[mikeknoop]

But how often are the ants in the presence of another living species?

If the ants were to one day take note of the living creatures around them they would most certainly come to the conclusion that they are not alone.

[PostOnce]

How often do the ants realize they're in the presence of another living species? Do they know humans are alive?

Maybe the aliens have been here all along and we just didn't realize it, heh.