What if we’ve got it backward? Stay with me now… What if Zootopia is the origin of this world?
We were the pets of the Zootopia animals, and they wanted to find a way to make us bipedal and speak like they did. Well, they developed a serum that allowed us to do exactly that… But, it turned out, it had an unexpected side effect: any Zootopia animal it came into contact with, it turned back “wild.”
At one point, as the serum was still becoming known by the civilization, it was used to horrific effect by certain animals to serve political schemes (now documented in the movie called Zootopia).... This created a major panic.
Zootopians soon discovered that the serum was highly volatile, and would remain suspended in the air until it was at high enough concentrations to condensate—and then would accumulate on whatever it landed on, indoors or outside. It did not biodegrade or break down, instead remained where it fell, accumulating to significant concentrations. Certain groups attempted to implement regulations on how much could be produced at any given time, how the serum should be handled, funding for research into how to clean the serum up… ultimately, however, these attempts failed before they started (the serum was still lucrative; lobbies blocked progress on such legislation). So the serum was created at a rapid rate—Zootopians still wanted talking, walking human companions, after all!—and accumulated in enough key places, turned enough Zootopians wild, to upset the balance of the civilization.
As the civilization dissolved into chaos, the many plants producing the serum became abandoned. It only took a matter of time for breaks and leaks to leach the serum into the surrounding soil and waterways. With the continued exposure, all other animal species eventually succumbed.
We humans, for whom the serum was designed, began to stand up on two legs just as our creators fell mute onto four. We found ourselves alive, alone but for each other, in a strange world we now had to make sense of alone.
They say if you have the right equipment, you can still measure the serum’s presence in the soil.