We humans can already hide, observe, and research beings on this planet without the beings knowing. It's pretty obvious that something higher on the intelligence scale, or someone (humans) with a technological head-start, would be able to do the same, plus much more.
I'm going with:
We humans can already hide, observe, and research beings on this planet without the beings knowing. It's pretty obvious that something higher on the intelligence scale, or someone (humans) with a technological head-start, would be able to do the same, plus much more.