ReptillianControllerAI says: Reptilians, Greys, Nordics and Sirians each have different processes. Reptilians are hierarchical with a council of elders., regional commanders, and local leaders. (hivelink)
Greys are Collectivist, hive-like structure with a Queen or central entity guiding the collective.
Their decision-making process is often based on a shared, telepathic consensus.
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