I think I remember reading somewhere that animals were being looked at in Shadow. I know there's also a customization to allow animals to last longer in the game. I also know that there was a mod to deal with this as well
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Still, the thing that is missing in all of these is that they're not set in a standard game. The animals are a great addition I think, but they don't last long enough. I've never created the Grand Menagerie in my many times of playing, and even putting a good bit of effort into it. Animals tend to disappear about 20 turns after you can even research the tech and level up a scout to grab them. OK, all known stuff, but I'm still ranting a little... on to the idea!
Dire animals/Named animals. I'd be amazed if this hasn't actually come up. Just like baby spiders, it's time for the other animals to grow up. Now with the ability to have lairs inside borders, there should be animal-spawning events. Ursus the bear should spawn along with a bear den on some random unworked tundra mountain tile. Every type of animal should have an event like this one. Unlike the current spawning baddies, it could be much more random (any turn between 1-500). I'd suggest 'dire' versions of the animals spawned from these special lairs that are able to move inside borders and attack towns (still -25%, but able).
That way, people could hunt them out to finish their collections. For those who don't care about the animal collections, it would be nice to get rewards for destroying the lairs (say a Great Bear pelt you can put into a town for extra cash/happiness).

Still, the thing that is missing in all of these is that they're not set in a standard game. The animals are a great addition I think, but they don't last long enough. I've never created the Grand Menagerie in my many times of playing, and even putting a good bit of effort into it. Animals tend to disappear about 20 turns after you can even research the tech and level up a scout to grab them. OK, all known stuff, but I'm still ranting a little... on to the idea!
Dire animals/Named animals. I'd be amazed if this hasn't actually come up. Just like baby spiders, it's time for the other animals to grow up. Now with the ability to have lairs inside borders, there should be animal-spawning events. Ursus the bear should spawn along with a bear den on some random unworked tundra mountain tile. Every type of animal should have an event like this one. Unlike the current spawning baddies, it could be much more random (any turn between 1-500). I'd suggest 'dire' versions of the animals spawned from these special lairs that are able to move inside borders and attack towns (still -25%, but able).
That way, people could hunt them out to finish their collections. For those who don't care about the animal collections, it would be nice to get rewards for destroying the lairs (say a Great Bear pelt you can put into a town for extra cash/happiness).