Thank you for your replies, but I'd have to try out the Mod myself to be able to say if it actually moves like a Malayan Tapir or not, or if it just looks more like one when not moving. Because the situation in our hands with the Official Malayan Tapir is both, so it also appears to be a Rig/Animation Problem, not just Cosmetic. A good example to this case is the Okapi, where the biggest problem reveals itself when the animal starts to move.
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The Baird's Tapir above might be an Extreme Individual, but highlights the Skeletal/Posture/Proportional differences well, which are bound to affect the way each Tapir species moves.
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These are more Average Individuals, but Skeletal and Posture differences are still very much apparent between South American and Malayan tapirs. To do justice to the animal a Complete Overhaul is needed in my opinion, even if Mods improve how it looks. Frontier might be having an all or nothing approach here, since mods already achieve the midway solution. People know more about Rhino differences than Tapirs, therefore it probably does not bother many when it comes to Tapirs and are happy with minor changes.
Editing the post to say the last sentence is probably also why Frontier took such a Gamble only with the Reskin Tapir.