Some generations ago, Tweeshach evolution did away with distinct genders. Fossil records suggest that at one point, the proportion of males greatly exceeded that of females, and it is strongly believed that the removal of gender requirements for reproduction was to counter the ever decreasing population of a Tweeshach ancestor; this has yet to be proved, but is the widely accepted theory.
The Tweeshach specialise in xenohistory and xenobiology, they not only have a significant interest in their own history, genetic or otherwise, they have significantly interested in how most other species in the galaxy continue to exhibit dual genders. This has led to Tweeshach being responsible for the creation of the main GSF galactic archives. They also make some of the best doctors due to their extensive knowledge of other species’ biology.
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