Species 125 were a humanoid carbon-based species native to the Milky Way Galaxy that have been assimilated by the Borg Collective by the 24th century. The most significant member encountered was an incarnation of the Borg Queen active in 2375; information about her species was discussed with Seven of Nine. It was unclear whether all versions of the queen were of the same species despite all having a similar physical appearance. (VOY episode: "Dark Frontier")

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