===Screechers?===

::''I quickly (and quietly) moved back from the edge of the rocks. And then I heard the screeching. Burroughs had retrieved a large object, a cage of some kind, covered with a black tarp. This cage was the source of the hellish emanations. Thick ropes hung down from somewhere deep beneath its dark shroud. "That's not far enough," he said. As if to prove his point, he shook the cage he was holding. Ever viler screams shot forth, cutting through my head like cold, sharp blades. But they were nothing to the sound I heard next – the deathly churning of sand that heralded the arrival of the thresher.