I just came up with the thought that seeming that Interns have those large, spindly hands, and that may be what they used to swing through the trees, they may have had appendages on their legs where the stitches are that also helped them swing through trees with all four limbs. They may have been unsuitable for walking on flat surfaces, so they developed hooves. When the Vykkers discovered them, they simpy removed them because they didnt want them to be very mobile.
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