I bet Capron would like to find something more exciting than a solitary muntjac! I think Zoochatters in general may simply not know that there is nothing harder to acquire right now within AZA than smaller mammals and it's even worse if the exhibit is not covered with mesh - you rule out cats, small primates, coati. Even a single muntjac is challenging.
It amused me that recently saw someone on Zoochat criticized the fact that in a certain exhibit at my zoo we replaced a rare and sexy species with a very common species. Guests like the replacement species as much as the previous species so we scored okay on the most important front. We had to work to find ANY mammal to replace the previous animals after they died given that we all agreed it should stay a mammal exhibit which is not meshed over and we didn't really need another crane exhibit. No available pudu or muntjac (plus our state bans cervid shipments for fear of deer wasting disease), we already have mara, cape porcupine and bat-eared foxes, fennecs would love it but completely invisible in 1800 s.f. of grass and shrubs. What's left? Mammal crumbs

I was even offered the ancient pair of non-breeding aardwolves at Cincinatti but that wasn't going to fly. Sigh.