Rename a method in Ruby

gistfile1.rb

class Animal
  def speak
    puts "..."
  end
end

class Cat < Animal
  def speak
    puts "Mew..."
  end
end

cat = Cat.new
cat.speak # Says "Mew..."

class Cat
  alias_method :mew, :speak
  remove_method :speak
end

cat.speak # Says "..."
cat.mew # Says "Mew..."