They come to learn that the planet has a native species of deadly bat-like creatures that preyed on the residents of the settlement but only hunt in darkness, staying in the planet’s cave systems otherwise. The creatures are useless against life and so sensitive to light that even the smallest amount makes them coil away in fear, but their deadly nature, and attraction to blood and desire to feed draws them to the crash victims, especially when Riddick realizes that Jack, a young runaway disguised as a boy, is female and on her menstrual cycle, Riddick tells the others that her blood is attracting the creatures. And it is. They are carnally drawn to it. The Grue hunt in their hoards and are certainly a monster you don’t want to run into in the dark of night.
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