Well, we know that the Glukkons' bodies have changed with time- for example, we know that their eyes cannot see in daylight, since they swore ages ago never to look at the sky again, since it contained, that filthy, horrible moon that those little Mudokons were using as proof that they were the Chosen Race. So, I expect other things about them could have changed just as easily.
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"What glukkons lack in legs, they make up for in fashion sense"
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