Aplastodiscus leucopygius
Many of the places where this frog lives are in national parks, for example, Parque Estadual Nova Baden.  So it is not in danger of dying out.  But there are still fewer of these frogs than there were.  This is because human beings change the places where they live.  Human beings cut down trees and change wetlands to drier lands for wood for building or to build farms or make places for animals to eat grass.