Well, I didn't ask that last question, but we got an answer anyways.
Someone by the name of Gianni The Best decided they would take the time to go through all of Zootopia frame-by-frame and remove all the frames that had any animals in them. As it turns out, that removes a full 97% of the movie.
Really gives you a new perspective on the fact that each animal in Zootopia had hundreds of thousands of individually rendered hairs. They really didn't cut any corners, there was pretty much always at least one animal on screen at any time. So props to you, Disney! This random fact makes your awesome technology that much more impressive!
Check out the video after the break!