duck_typing.rb

class Duck
  def quack
    puts "Quaaaaaack!"
  end

  def feathers
    puts "The duck has white and gray feathers."
  end
end
 
class Person
  def quack
    puts "The person imitates a duck."
  end

  def feathers
    puts "The person takes a feather from the ground and shows it."
  end
end

def in_the_forest(duck)
  duck.quack

  duck.feathers
end
 
def game
  donald = Duck.new
  john = Person.new

  in_the_forest(donald)
  in_the_forest(john)
end
 
game