Assimilation is the Borg's means of adding or replacing drones, as well as their sole purpose of existence. New technology and knowledge is gathered in this way, and nearly every species encountered has been assimilated easily. Species 8427 is the notable exception. Assimilation is achieved by injecting nano-probes below the the victim's subcutaneous layer into the bloodstream, whose blood cells are then attacked and subjugated by the probes to work together and lay the groundwork for connection to the collective. Thousands of such probes can be injected within seconds, making the effects of initial assimilation immediate. Bio-technological interface with Borg cybernetic implants and attachments are also created by the nano-probes in preparation for surgical procedures that may include modified extremities for specific tasks, or optical and aural implants. Constant to all assimilated drones is the neural implant that is unremovable once installed. It is the actual connection the drone has to the rest of the collective, relaying all orders while maintaining records, coordinates, and other information about the drone's activities. Hive Structure:The immense knowledge of all the assimilated Borg minds function as one, and each Borg is part of a giant subspace communications network called the Borg Collective. All critical information is relayed to each Borg through this network, allowing the instantaneous adaptation and reaction to any outside factors. The Collective is organized into a social hierarchy composed of several social hives with drones and a Borg Queen. The Queen does not function as a breeder of new drones, but the central consciousness that dictates the will and motives of the collective. She uses the pronoun "I" instead of "We" but does not appear to be truly individual, instead maintaining an awareness above that of an ordinary Borg.
A list was created, see Species Designation