A historical image of Ringo in the old habitat, if anyone is interested, from the
Images of America: Milwaukee County Zoo book.
View attachment 752649
I agree that it's disappointing what's become of it. It was not a sufficient exhibit for otters in terms of space, but it is quite a bit larger than the individual arboreal habitats and the having an active animal in there justified the large use of space, and it was good to represent a semi aquatic species. I'm not sure what would fit there today but sloth are such an inactive species that they didn't feel like they justified the large space any more than putting lemurs or monkeys in there would have. I never did see the agouti there.
The only other semiaquatic species I could imagine would be small-clawed otters, beaver, or capybara and all would need a larger exhibit nonetheless, and probably outdoor access if we're honest. I hope the plans to construct a brand new small mammal house remain; perhaps an indoor/outdoor exhibit for one of these species could be a good compromise to fill the same niche as that former space while avoiding its pitfalls.
That's a smart idea. I don't know what the limits on a sloth mix are but I know Lincoln Park held sloth with pied tamarin for a people, I've seen them mixed with night monkey before, and I believe London has them mixed with several species such as tamandua, goeldis/callimico and more, so it's possible!