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Glukkons and Oktigi share a relatively recent common ancestor. It may be that their speciation is an important point in the backstory. Gloktigi are also related, but are supposed to be a hybrid between Glukks and Oktigi to produce a highly egotistical elite bodyguard race.
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Remember also that the current Glukkon shape and appearance was the result of the self-experimentation they performed during the Age of Alchemy. We don't know for sure what they looked like before then.