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The true form of such creatures is a dark, leathery beast, something like a shark. They hide that body beneath a perception filter that manipulates the brainwaves of whoever's looking at them. Which means that sometimes you won't see them in mirrors. But a human's sense of self preservation means they're always aware of the fangs. In their natural form these vicious predators live underwater.

To continue their species the disguised survivors of Saturnyne drank from their female human victims until all the liquid had been removed from them. Then they replaced that liquid with their own blood. Gradually, the alien blood changed the victim into one of the aliens, ready to mate with the male aliens, hiding and feeding in the Venetian canals.