The Christian afterlife, when lions can be petted by humans while sitting next to a lamb, without fear of getting mauled. Since humans are of the animal kingdom, they will behave good too.
In the age of well-behaving animals, no strain of bacteria would not make us sick, and elephants wouldn't trample children.

In the age of well-behaving animals, no one would bother going to war or steal from someone.
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