The hard shelter requirements aren't so out of whack for large ungulates, but they really seem extreme for some of the smaller mammals and carnivores (like wolves) who shelter in very small burrows in their natural habitat.
For example, I just made a wolf habitat with a huge underground cave. There should be room for a dozen or more wolves in there with room to spare, but two adult wolves only had about 40% of their shelter needs met. And with the really small mammals, like meerkat or fennic foxes, if I make a small habitat that meets their needs space wise, I can't even create a shelter (using rocks or building materials) that is big enough for them unless it takes up most of the space. Google "wolf den" to see what size they actually are at real zoos, or in the wild. Would love to see more realistic requirements.
For example, I just made a wolf habitat with a huge underground cave. There should be room for a dozen or more wolves in there with room to spare, but two adult wolves only had about 40% of their shelter needs met. And with the really small mammals, like meerkat or fennic foxes, if I make a small habitat that meets their needs space wise, I can't even create a shelter (using rocks or building materials) that is big enough for them unless it takes up most of the space. Google "wolf den" to see what size they actually are at real zoos, or in the wild. Would love to see more realistic requirements.