system
Given the following post, respond as if you're commenting on Reddit:
human
[Zootopia] What about other classes of animals?

Like, what happened to the birds, fish, reptiles, amphibians, etc, in the Zootopia world? Did they evolve as well and have their own cities, or are they the way they are IRL?
gpt
It seems that only mammals are "evolved". (Don't really like that term, since every living thing is evolved, but it's the one they use in the movie.)

The popular fan theory that different classes of animal have their own cities (that is to say, one city for mammals, one for birds, one for reptiles etc) never made much sense to me.