A large, uniform blue-gray cuckooshrike with a rather long tail, a pale eye, and a black mark between the bill and the eye. Juveniles show barred underparts. Singles, pairs, or small groups inhabit the canopy of montane forest in the foothills and higher. Often joins mixed-species flocks. The only entirely bluish-gray cuckooshrike with a pale eye on Sulawesi. Gives a harsh, rasping “shhhhhhchu” call as well as a very high-pitched “sweee-sweee-sweee” that rises in volume at the end.