Just think of the typical bird form through to a Mudokon and you can see it. Powerful wing muscles retained as they evolve into arms, which therefore are slightly different. Also, the wing powering muscles left over that were attached to the breastbone are still there, you can see them stretched across a Mudokons' chest. Their skull structure also slightly correlates, notably the jaw.
I presume Muodkons evolved from some sort of ground bird, so there wasn't the power of flight to worry about when evolving arms instead, and the bird was still well equipped enough to survive after wing loss, or for that matter, even more so.
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