Is there any kind of climbing structure apart from those saplings? Looks like a very big and spacious aviary, but without much climbing possibilities for the largely arboreal lemurs.
@EmperorTamarin Nothing larger than what you see in these photos. This enclosure is on the site of the old Europe on the Edge exhibit (formerly polar bears) and it didn't include any large trees, unlike the walk-through and fossa enclosures, that encompass trees from the old tiger -> sun bear -> binturong enclosure and former childrens' zoo respectively.