Planet Zoo's subspecies representation has always been kind of weird...My unpopular opinion of the week is that people don't care about subspecie level of difference or diversity, This show by how little people mention that the african buffalo or wild boar should be specified considering how different some subspecie are from the animal ingame. The cats and brown bear only get a pass to be split because they subspecies are well know.
A lot of subspecies seem to be added just to pad out the roster: Siberian AND Bengal tigers, Grizzly AND Himalayan Brown Bears... However, it seems that most of the time, an animal gets a second subspecies in the game when said new sub is different from the one already present. Good examples include:
• the African Leopard, which is very different from the Amur leopard both in appearance and range (being found in entirely different habitats on entirely different continents)
• the American Standard Donkey, which technically belongs to the same species as the Somali Wild Ass but is different both in terms of range, and in terms of interactivity with guests.
• the Arctic Wolf, which looks very distinct compared to the base game grey wolf.
However, subspecies often get problematic in two main ways:
A) The new subspecies is already included in the range map of its other counterpart. Infamous examples are the Arctic Wolf, which is already counted as part of the "timber wolf" range, and the new Bornean Pygmy Elephant, the range of which is already included in the map for the base-game Indian Elephant (which is technically incorrect).
B) an animal that is clearly meant to be of a certain subspecies gets added, but is counted as the entire species.
This is the case for the Dama Gazelle (clearly supposed to be the Addra sub, Nanger dama ruficollis), Takin (which looks a lot like the Sichuan takin, Budorcas taxicolor tibetana),
or the Markhor (meant to be the Tadjik markhor, Capra falconeri heptneri), and the aforementioned wild boar.
The timber wolf is a particularly bad example of this as well, since it's clearly based off of the northwestern grey wolf (at least this is what the animal is called in at least some translations of the game), but it's meant to represent the entire species Canis lupus.
A particular case is that of animals with overly specific subs that don't really matter to anyone, and sometimes come off as pretty baffling. The most infamous example is the Formosan Black Bear, but at least a couple other animals seem to have unnecessary subspecies (such as the West African Lion or the King Penguin, which is listed as Aptenodytes patagonicus patagonicus).
At the end of the day though, I'd say that subspecies are only relevant when it comes to animals with such a wide range of habitats and phenotypes that it would be impossible to include them all in one singular "generic" animal... Which is why I wouldn't be too opposed to having two wolves (let's say, Northwestern and Eurasian?), two brown bears (Grizzly and Eurasian?), or two leopards. Two tigers however seem like too much, and they could easily be lumped into one "generic" tiger (and maybe see the addition of the Sumatran tiger later on)
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