"This chicken is strange."
Translation:Tämä kana on outoa.
Since there's no way of telling whether the "chicken" in the question is a mass noun (foodstuff) or a count noun (animal), Tämä kana on outo should be accepted, I think. And, indeed, it is accepted—but only because Duo thinks "outo" is a typo for "outoa". And because it is accepted, there's no option to report that it should be accepted...