I’m not sure if I maybe entirely misunderstood you when I wrote this reply and you really just want animals that are not held in captivity anymore in which case: sorry for the wall of text lmao
I took it as a vintage themed pack with old attractions like PC
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While I personally find the history of zoos fascinating and almost more so then the modern zoo itself, unfortunately I think the difference here is that zoos are still fighting hard to get away from the images that people who are against zoos still have of it: iron bars, concrete, nowhere to hide.
While for theme parks there is a lot more nostalgia in old rides, the design of the rides (where In PZ we design the habitat ourselves) and it’s reasonable and save to still run old attractions (for example the Prater in Vienna).
This is not to say there is NO way of bringing old nostalgia into it! I just think it’s a lot harder to do without it being somewhat controversial or feeling out of place.
Again, this is not a knock on your interest in vintage design or history of zoos, I very much share that fascination, I just think it’s easier for a theme park to maintain a vintage ride then for a zoo to maintain old exhibits without it being controversial.
But some things I could see:
Implementing the animals you mentioned in a museum type DLC (highly requested too)
Vintage designed popcorn/Corn Dog/cotton candy/peanuts hand carts
A Mary-go-round carousel
Some elaborate detailed decorated metal (fence) pieces
Challenge to run a zoo without any modern technology (like habitat cams)
Potentially keepers walking animals through the zoo (it’s still being done but more common back then)