I know I'm the one pointing out the musk ox does not belong in the mountains pack because its an arctic tundra animal by nature. Those pictures are musk ox in the dovrefjell national park in Norway where they are reintroduced because of the similar climate to the arctic tundra, I believe its the only example of musk ox permanently living in such mountainous regions.
Ach there’s sometimes a technicality in each pack though!
• Red Eyed Tree Frog in South America, which happens to be a Central American species with a very minimal distribution in South America.
• Dingo in Australia, despite debate over its status as a descendant of introduced domestic dogs or as its own species.
• Ussuri Dhole in Southeast Asia, a subspecies of Dhole native to mainland Asia.
• Fallow Deer in Europe, which was introduced from Southwest Asia to Europe 9,000 years ago.
• Striped Hyena in Grasslands, because whilst it does have Grasslands presence, it is much more associated with deserts and arid regions.
• African Crested Porcupine in Arid, even though it avoids deserts and fully arid regions like the plague, and is more associated with grasslands and rocky hillsides.
I’m not saying the Muskox belongs unequivocally in a Mountains Pack. I think if we get a Tundra Pack, it should definitely come in that one over any kind of Highlands. BUT we shouldn’t rule it out as a contender - it lives in the mountains, that’s all that’s needed.