Explain the threat, if any, they pose to humans.
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Graff describes them a giant space ants. They have a keen intelligence that rivals, if not surpasses, human intelligence. Being kind of like ants, they need Earth like conditions. Their society is structured like our ants or bees. They communicate telepathically. They didn't intend to cause human suffering. Once they realized that their earlier visit/invasion caused human death, they pulled back. They actually didn't pose a threat any longer but certain humans wanted them wiped out.