system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do tropical, desert or savanna animals survive in zoos in cities where winter are below freezing?

Could it be that those animals are sheltered inside during winter? But what about nature preserves like Columbus zoo? Animals are roaming free there.
gpt
Almost all zoo animals have a den in their enclosure.  These are heated/cooled to a comfortable temperature, usually with water running in tubes through their floors.  When you "can't find the animal", it hasn't escaped (except for Rusty the Red Panda, he's probably escaped again), it's simply decided to lie down on the warm floor and watch the snow fall outside, like humans would do.