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Even after a major cleanup, this article still needs a category.
The Sibro were very small in numbers. There were only thirty of them, born from the same tree they never repopulated. The Doctor, in his first incarnation, saved half of them when their planet was impacted by a meteorite and was slowly moving towards the solar system's star. The Doctor didn't know what happened to the Sibro species, only that fifteen of them might still be alive.