animals.rb

module Flight
  def fly
    "I'm a #{self.class}, I'm flying!"
  end
end

class Animal
  def initialize
    @num_legs = 4
  end

  attr_reader :num_legs

  def talks?
    false
  end

end

class Mammal < Animal
  def warm_blooded?
   true
  end

  def num_arms
    4 - @num_legs
  end

end

class Bat < Mammal
  include Flight
  def initialize
    @num_legs = 2
  end
end

class Primate < Mammal
  def initialize
    @num_legs = 2
  end
end

class Chimpanzee < Primate
  
end

class Amphibian < Animal
  def warm_blooded?
    false
  end
end

class Frog < Amphibian

end


class Bird < Animal
  include Flight

  def initialize
    @num_legs = 2
    @num_wings = 2
  end

  def num_wings
    @num_wings
  end
end

class Parrot < Bird
  def talks?
    true
  end
end

p Parrot.new.talks?