A large bird of forest interior from the lowlands to mid-mountains. Long tail, thick bill and an overall slate gray plumage with black wing edge and tail tip. Male has a black mark between the eye and bill. Similar to several gray-colored cuckooshrikes and cicadabirds but most of these have thinner bills. Boyer’s also has a stout bill, but Stout-billed is much larger. Voice, a loud, grating, nasal, 2-note “raaooo-raahhh!” with the first note falling and the second, rising then falling.