Unless you're making Zootopia, in which case -- for the first time in Disney history -- absolutely everything is moving. And by "everything" I mean, in fact, "all the things." Every shadow shimmers. Every car sputters. Every strand of hair twitches and wafts in the wind. All 30,000 leaves on that tree are moving, thanks to technology developed just for this movie.
Finally, a film can recreate the nightmarishly overstimulating reality of living in a real city.
Part of the reason this is so crazy is, as made clear in the first paragraph of this entry, it's completely unneeded. As humans, we're pretty dumb, and aren't likely to notice that maybe that bush back there doesn't have an ant crawling on it. But Disney had to push the boundaries, just like they always have, to create a living, breathing, utterly convincing world that is so magical and wondrous that it never even had to get around to explaining what the hell the predators eat in this universe. A fox can't live on blueberries, guys.
"Delicious! Also I'm so malnourished I'm literally going blind."