Finding a way to neutralize them would be easier if we knew more about their anatomy and physiology. We might be able to lay poison for them--if we knew what they eat and what is toxic to them. Or we might find ways to more efficiently kill them with ranged weapons--if we knew where their critical organs were located.

But with them having a built-in self destruct, I'm not sure how one of the medics can possibly get close enough to do an examination.