Can invisible unicorns see each other?

Okay, I’m not being quite as ridiculous as first appears, so bear with me.

We know the majority of the matter in the universe is dark matter. We also calculate that, on balance, there are probably millions of advanced species living on planets scattered about the universe. So considering those two facts it is possible, maybe even probable, that there are conscious entities made from dark matter (I have not hear of any characteristics of dark matter that would preclude this possibility).

However the problem with dark matter is that it is quite invisible. In fact we are yet to directly observe any. The Standard Model says that every matter particle is accompanied by an energy particle though, so we expect dark matter to have some sort of means by which it may be detected.

So if a species exists that is made out of dark matter (in this case a unicorn), would it also come with appropriate apparatus by which it could see its fellows? How would they interact? Or does the absence of knowledge about such a mechanism preclude their existence in the first place?