Not quite metamorphosis, it's an object. You know: Caterpillar --> (thing) --> Butterfly
Also: Jungola isn't a building. Wildlands is separated into three (outdoor) regions: Nortica, Serenga, and Jungola. Within Jungola, there are two greenhouses. The butterfly temple in the beginning, and Rimbula (the big greenhouse) at the end (or in the middle, depending on how you look at it).
In the butterfly temple there are Black-naped fruit doves. Palawan peacock-pheasants, Crested wood partridges, a single White-cheeked turaco, Ricordi’s robber frogs, Cuban brown anoles, Giant spiny stick insects, African giant millipedes, Congo chafer beetles, and around 15 species of butterfly free-roaming.
In Rimbula, the bigger greenhouse, there's slightly over 30 free-roamers, as well as a separated bird area with 8 additional free-roamers
@Mr Gharial Thank you for responses, it was indeed Rimbula that I was thinking of, and free-ranging millipedes and stick insects sound excellent - can't think of any other zoo that has them in a walkthrough space! Chrysalis, perhaps?