I finally managed to fit a South American mixed species habitat into the little southwest corner of my zoo. It currently houses llamas, peccaries and rheas, although ideally I'd love to design it for rheas, guanacos and maras. But I'm quite happy with it! It's right next to the American Desert House (with prairie dogs, armadillos and countless reptiles) and can be observed from the bridge that connects the South America section to the entrance plaza.
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Looking at the picture, I just noticed that all the three species are moving in groups right next to each other, which looks awesome!