Nate_dog_woof is right: Interns and Vykkers come from trees. Oddworld states on the XBOX official site:
"The Glukkons and Sligs came from the swamps. The Glukkons descended from octopus-like creatures while Sligs descended from a slug-like species. The Vykkers come from species that once lived in trees; they still have a tendency to try to live in the air. The Interns are a subservient race to the Vykkers. They are a bit dimwitted but make good assistants. "
Note: The Interns are a subservient race to the Vykkers. So they are sort of speciffically designed to serve Vykkers
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