Yeah, that's for sure. Still, as we kind of already nailed it down in this thread, it's a pretty safe bet that at least a large portion of the design inconsistency comes from the fact that large parts of PC were just ported to the game and all the animal related things were intended to be more realistic as a goal, in general. Additionally, with a larger team and Frontier also frequently working with external designers, it's a tough task to keep things very consistent.
As an example, there also have been other lion's appearances in the concept phase. Why have they finally chosen a more cartoony look? Who knows.
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I have seen that picture before in Artstation, and you are correct it does seem quite different from what we end up receiving. What this clearly shows to me is that during development they could have easily went with a version of the lion that was more realistic. My reasoning behind their choice was during the initial phase of development they might have felt that certain animals looking a lot less menacing and instead playful would translate better with a younger audience. To use again the example of the lion, they are magnificent and powerful predators, anyone that has ever come in close contact with one, will agree that their intimidating features are a great part of what makes them a stunning sight. When you take this animal, one that should be a highlight within the game, and turn it into a more friendly version that could be confused with the lion in Madagascar (the cartoon movie) you are actually not only doing a great disservice to this mighty species, but losing as a game, what should have been an awe moment every single time a lion is adopted.
I stand by what i said earlier, until the contrary is proven, the majority of the players of this game are adults, and prefer realism (even some of the younger audience does appreciate it as well) That is not to say that there are not others who do play the game, that will prefer a cartoon version of it. My position here, is the same as with mythical and fantasy creatures and such, there is plenty of content and games like that out there already, but only one Planet Zoo.