OMG I just had an idea about the reserves and the more I think about it, the more I think it has legs - and I'm getting quite excited about it!!
What if the reason we have only seen two reserves so far is because they are the only two that are unlocked at the start of the game, but as you prove yourself on these reserves, you can unlock others through gameplay?
They have spoken about building your career and your network with FEN - so this makes perfect sense! Maybe they branch out into different trees, like the Scottish one is focused on rewilding skills and unlocks perhaps the other European or a North American one, while the African one is more about your research and management skills and it unlocks one in South America or Sumatra? Or perhaps you get to choose which reserve you get to unlock next....or they unlock one by one in a set order? Whichever way it works, it builds up bit by bit, so there is more gamification, just like we've been asking/hoping there would be: having to actually complete some gameplay before knowing where all the reserves are and how we get access to them!
Every mention of the reserves in the Zoopedia site mentions these 'conservation projects' and meeting 'specific requirements' - maybe these projects and research missions are part of the way that we 'complete' a reserve and allow us to level up and unlock new ones? The vehicles driving around might actually not just be for fun, but perhaps we have targeted missions to go on as the researcher ourselves, getting photographs of different wild behaviours and things??!
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This would explain very very well why the roster has been so focused on the species for these two reserves during the build up, because they want to show the reserves fully populated in the video on Thursday (not long to debunk that idea, let's see!) But in fact, there is a roster waiting for the other reserves, we just won't know about it maybe even until launch, so that we can discover things bit by bit. Maybe we even unlock some animals through gameplay as well? So we won't even see them in the in-game zoopedia at first? That seems less likely but is still an idea... would be so epic though if that was the case! They could all be available in Sandbox for those who don't want to have to unlock them.