Is it a mammal? (yes/no) maybe
Please answer yes or no.
Is it a mammal? (yes/no) yes
  (taken as yes)
Does it have feathers? (yes/no) dunno
Please answer yes or no.
Does it have feathers? (yes/no) no
  (taken as no)
Does it live in water? (yes/no) no
  (taken as no)
Asked 3 questions.
