Woodland bird of eastern and northern Australia, New Guinea, and eastern Indonesia. Strong sexual dimorphism in plumage. Male dark slaty-gray, with black around bill, and black on wings. Female brown, with dark line through eye, extensive fine barring on chest and belly, and fairly plain brown wings (much browner and lacking the white wingbars of Varied Triller). Calls include a long (10-second) sequence of insect-like repeated buzzes (hence its name), also a slower version, and a robin-like sequence of clear whistled notes.