class NilGoose
  def name
    'Demo Goose'
  end
 
  def status
    'awake'
  end
 
  def color
    'black'
  end
 
  def migratory?
    true
  end
 
  def method_missing(name, *args)
    super unless Goose.new.respond_to?(name)
    name.ends_with?('?') ? false : nil  end
end