Having extra limbs may have been use to Vykkers when they were tree dwellers, for maybe they often had to be connected the trees they were on to survive. For example, they needed two of their limbs to feed on their food, while they needed to the rest to have a nice hand and feet hold on the trees. Super natural intellgence could have been the result of genetic inbreeding or simply it was the result of having too much free time.
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