I’ve been working on a theory for Zootopia 3 that expands the existing world and explains why reptiles, birds, and dinosaurs never appeared in the city.

And a disclaimer , yes i did use chatgpt to compile my ideas because i am too lazy to compile it myself , so just bear with me.
Long-hidden lineages of birds and reptiles, from present-day species to ancient prehistoric flyers like pterosaurs, reappear after millennia of isolation in my version of the sequel, drastically altering the continent's social, political, and ecological landscape. The Aves are sharply divided despite being formally united under a single alliance: while the ancient dinosaurian flyers cling to their ancestral pride, tradition, and dominance, occasionally harboring radical factions intent on regaining their lost authority, the modern birds ,  who are intelligent and adaptive, seek coexistence and coexistence with mammals. As survivors of a long-ago catastrophic event, the reptiles have also undergone independent evolution and now seek acknowledgement, territory, and a say in the governance of the continent.Zootopia's biome-based regions react to their arrival in radically different ways: desert and tundra mammals react with fear, suspicion, and competition; residents of the rainforest revere the newcomers as divine or mythic beings; and urban centers experience a mix of awe, economic opportunity, ethical debates, and chaos in society as the boundaries of law, predator-prey relations, and urban infrastructure are challenged.  This remarkable combination of ancient and modern species forces Judy to confront questions of identity, coexistence, and adaptation.