Planet Zoo 2 Speculation and ideas

I'm assuming you mean statues and signs unlocked in that mode, the same way research unlocks content.
Oh yeah, for creative builders they should have it in Sandbox. But for folks who play Franchise or Challenge it would be a cool way to show how involved your zoo is with conservation. Maybe with captive births, releases, research, and protection of wild spaces you can unlock more for your zoo.
 
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