At D23, Jennifer Lee, who was one of the writers of Zootopia, claimed it was the WDAS movie which immediately came to mind when thinking of the themes of Animal Kingdom: connection to animals, intrinsic value of nature, and the transformative power of adventure.
See, Zootopia is not like Robin Hood, etc. When director Byron Howard pitched it to then-studio head John Lasseter, Lasseter asked that Zootopia be a diiferent take on anthro animals: a story about a civilization with no humans built by animals for animals: wolves that howl, wildebeests that travel in herds, rabbits that have giant families. Different sizes, different diets, different habitat needs.
Not humans.
That's the primary theme of Zootopia: how would such a animal civilization work? The theme of bias flows from this.