Only 0.2 Javan Langurs remain unfortunately In better news, the zoo is just shy of 20 Silvery Lead Monkeys last I heard!
As for the grass, I think it's the result of the aging primates not using the floor so much anymore so the grass has grown in. I'm not sure what will become of this habitat once the remaining langurs die off, but I imagine they will be replaced by Francois' Langurs (though I hope for Lion-Tailed Macaques!)
I also would like proboscis monkeys to once again inhabit this exhibit, and I would also like to throw out another potential name for this exhibit: red-shanked douc
@Loxodonta Cobra In a mangrove-themed exhibit (first of all, wrong environment) where even the wrong soil can kill them off (second of all, husbandry issues)? I'd honestly see them in a habitat akin to Bronx' Wolf's guenon habitat, where there are natural elements but it is for the most part sterile. Zoo Chleby has them in an absolutely sterile environment (and even had them successfully breed IIRC)
@Matthew Guimac Yes as there are very few langurs left in the US. In fact, I think these are the only two left in the AZA. EAZA has a thriving population, though.