dˈɑːɹk mˈɔːɹf ɪz ˈæʃi ɡɹˈeɪ ˈɔːl ˈoʊvɚ, ɛksˈɛpt fɚðə tˈeɪl ænd ˌʌndˈɜːwəɪŋ koʊvˈɜːts; sˈʌmtaɪmz ɛkstˈɛnsɪvli mˈɑːɹkt ɹˈuːfəs ɔnðɪ ˌʌndɚsˈaɪd.
Dark morph is ashy grey all over, except for the tail and underwing coverts; sometimes extensively marked rufous on the underside.