class Things:
    pass


class Inanimate(Things):
    pass


class Animate(Things):
    pass


class Animals(Animate):
    def breathe(self):
        print('breathing')

    def move(self):
        print('moving')

    def eat_food(self):
        print('eating food')


class Mammals(Animals):
    def feed_young_with_milk(self):
        print('feeding young')


class Giraffes(Mammals):
    def eat_leaves_from_trees(self):
        print('eating leaves')


reginald = Giraffes()
harold = Giraffes()
reginald.move()
harold.eat_leaves_from_trees()
