Headcrabs perfectly fit on human heads. But they must have evolved to that point on their home world (which is not Xen, btw.) without humans. How did their food chain look like before they came (escaped from the Combine, really) to Earth?
Headcrabs perfectly fit on human heads. But they must have evolved to that point on their home world (which is not Xen, btw.) without humans. How did their food chain look like before they came (escaped from the Combine, really) to Earth?
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