The Kharaa are actually a very strange species. We assume they, at one point, were a cohesive species, but after conquering and assimilating so many different species... Oh I'm getting ahead of myself. What I mean is that they use what they conquer, mutating them. The real Kharaa is the parasite that infects it. It's a type of bacteria, we think, but we aren't sure. Once inside it can change a species into whatever it needs through rapid mutation. A human-Kharaa hybrid will seem to know it was not a Kharaa once but no longer care, reduced to an animalistic state of mind and driven to conquest. There are no reports of any way to reverse it.
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