I feel like I am one of the ones that is chill with whatever. Is there animals I would love to see in the game? Absolutely. Do I make wishlists and participate in the metalists etc? Yes, I do for fun. Do I remember in a months time what I put on that wish list? No, I do not. Personally I am just thrilled that the game is getting support, that interesting and new animals are getting added reliably to the game to keep things fresh, and the frontier is so focused on being responsive to the community.
I do find it draining that often there is a lot of negativity over animals that are "missing" from each pack, or that X y z choice would be better. . I have lurked on the forum for a while, and I do read a lot of the posts that are up even if I'm not interacting with it. I do feel like it comes from a place of fear that we have only so many animals left and what if Your animals aren't included? So you are vocal about it. I think it is important to remember that while Frontier is incredible with their community engagement and support, they are still a profit driven business that needs to appeal to a broad spectrum of demographics to achieve high sales to continue being successful. All of us here are passionate about animals and are generally more knowledgeable than the casual player, but remember that the casual player is the foundation of frontiers profit base, which is why animals like the brown throated sloth, the quokka, the sand cat etc are included - it's because Frontier is looking at what will act as a hook to draw in the general public, while also trying to balance it with the desires of their loyal fanbase (us) and trying to keep their own personal twist on things too. Clearly that formula is working for them as pz is one of their top performers.
I've gotten a few of my casual gamer friends into the game and have gifted it a few times when I can have even convinced them to buy DLC here and there. I don't really hear from them " oh i wish this was animal X instead" or " this animal is held in low numbers in captivity" it's "omg look how cute this sloth is" or "aww these meerkats are so tiny". That's exactly the kind of reach Frontier is trying to have with other gamer demographics that aren't zoo/animal buffs. I think it's important to keep that in mind when thinking about the roster in each pack. My best friend got the game because she got hyped listen to me talk about it, and she is excited about the quokka because she's seen it in memes in the last few years, and I think that's exactly what Frontiers aim has been with a few animals
(Way for me to over repeat my point huh

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I absolutely agree that as a community we really should be thinking about what animals as a whole are essential to the game, and not just to our own desires. I know it is hard to separate the two when what we each deem as essential is built up from preferences, experiences, and opinion. Maybe we could look at finding out what the most common animals in captivity are (an undertaking of reasonable size I know), cross referencing to what we have in PZ, and figuring out what's lacking and working out what's essential from there?
Another thing for people to consider is mods.
I also intend to use mods when support ends. The modders are doing an incredible job at creating new animals - I don't use them but I do keep an eye on what's being released, because I enjoy seeing what is out there. I know mods aren't for everyone but I know that my most wanted animals have been made, and it doesn't bother me if they don't officially get into the game. I know that the option is there. I know it's not for everyone but I think its a point to consider