Bambi

Thousands of years later, Humankind will destroy the ecosystem, and pollute water. Even worse, World War 3 would have brought destruction to the entire planet. The earth will have been polluted by toxic waste; nuclear weapons would have brought extinction to many species, but some survive. In the future, grassland would have turned into deserts, forest would have vanished from the Earth. Deers are forced to live in extreme conditions; in fact, the deer's genes mutate, and many deers have died in the process. As for the lucky ones, they survive. The change is enormous; the deer have turned into creatures that feed on blood and flesh. They are able to walk like humans and their front legs have evolved into arms, they would grow gigantic tails to protect them from predators. At last, many animals would evolve into "monsters" or turn into skulls.