ruby-on-rails – 如何在Ruby中调用super.super方法

class Animal
  def move
    "I can move"
  end
end

class Bird < Animal
  def move
    super + " by flying"
  end
end

class Penguin < Bird
  def move
    #How can I call Animal move here
    "I can move"+ ' by swimming'
  end
end

如何在Penguin中调用Animal的移动方法？我不能使用super.super.move.有什么选择？

谢谢

class Penguin < Bird
  def move
    m = Animal.instance_method(:move).bind(self)
    m.call
  end
end