Part 1, the returned phase 2s. The resistance is looking for alternative food sources, but it seems their bodies' trophic needs won't let them eat anything else quite as efficiently. Wolves and sharks have been suggested.
Part 2, origins. They aren't human and can't have offspring with humans or each other. Their skin color is basically random - they just picked tones that are similar to the inhabitants of the areas they invaded. It was for blending-in purposes.
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