AZA accredited zoos (Like the Lincoln Park Zoo) have a requirement for their animal habitats that the animals are freely allowed to go outside where they be be viewed by guests, or they have private spaces inside where they can retreat to. Most zoos try to place much of their enrichment and treats outside to make that space more appealing, but ultimately, it is up to the animals behavior on any given day. Especially if it is a hot, dry day, they may prefer to be inside where there is more shade, possibly cooler air, and such
When we went a few weeks ago we saw many animals inside and outside, almost all exhibits have an indoor portion as well as an outdoor. Everyone must remember this is a zoo where you observe animals in their simulated environment. This is not a circus where animals are trained to perform for your enjoyment.
Its up to the animals where they want to be. Dry or not, its really their preference.
I was thinking the same thing when I went. A zoo but where are all the animals??
Thanks! Your answer is awaiting moderation.