A medium-sized bird of lowland forest canopy. Blue-gray plumage with darker wings and tail, and slightly paler head. Male has a black face. Similar to male Common and Gray-headed, plus female Papuan and Black-bellied Cicadabirds, but Boyer’s has a paler head, stubbier bill and rufous underwings. Also similar to Stout-billed Cuckooshrike, but much smaller and shorter-tailed. Voice, long, piercing, nasal “kiiieeeuuu!”, which can be either upslurred or downslurred.