A medium-sized, long-tailed bird of montane forest and subalpine shrubs. Dull gray-brown underparts and head with contrasting rufous rump and dark wings. Two forms occur. One with a gray brown tail, the other with a dark tail with a broad rufous band on the end. Mixed pairs often occur. Forages fairly low with tail and wings spread. Similar to female Black Fantail, but Dimorphic has more gray-brown underparts and lacks the black central tail feathers. Song, a tuneless jumble of tinkling notes.