A drill bit for drilling a borehole in a subterranean formation, the borehole having a gage diameter, the drill bit comprising: a bit body having a bit axis, a first end configured to be coupled to a lower end of a drill string, and a second end configured to engage the subterranean formation, wherein the bit body includes a plurality of legs circumferentially disposed about the bit axis, wherein each leg has a lower section extending axially from the second end of the bit, and wherein each lower section has a leading surface relative to a cutting direction of bit rotation about the bit axis and a trailing surface relative to the cutting direction; a plurality of rolling cone cutters (131; 132; 133), wherein each rolling cone cutter is rotatably mounted to the lower section of one of the legs and positioned along the leading surface of the corresponding leg, wherein each cone cutter has a cone axis of rotation that is radially spaced from the bit axis and is substantially perpendicular to a plane containing the bit axis; and a plurality of circumferentially-spaced fixed blades (121; 122; 123), wherein each cone cutter includes a first plurality of cutter elements arranged in a first circumferential row extending about the corresponding cone axis of rotation, wherein each of the first plurality of cutter elements includes a planar cutting face that is configured to engage and shear the subterranean formation when the bit body is rotated about the bit axis in the cutting direction, characterised in that each fixed blade is integrally formed with the lower section of a corresponding one of the legs and extends radially outward from the lower section of a corresponding one of the legs, wherein each fixed blade has a radially outer formation-facing surface circumferentially disposed between the leading surface and the trailing surface of the corresponding leg, and the drill bit comprises a second plurality of cutter elements mounted to the formation-facing surface of each fixed blade and configured to engage and shear the formation when the bit body is rotated about the bit axis in the cutting direction. a bit body having a bit axis, a first end configured to be coupled to a lower end of a drill string, and a second end configured to engage the subterranean formation, wherein the bit body includes a plurality of legs circumferentially disposed about the bit axis, wherein each leg has a lower section extending axially from the second end of the bit, and wherein each lower section has a leading surface relative to a cutting direction of bit rotation about the bit axis and a trailing surface relative to the cutting direction; a plurality of rolling cone cutters (131; 132; 133), wherein each rolling cone cutter is rotatably mounted to the lower section of one of the legs and positioned along the leading surface of the corresponding leg, wherein each cone cutter has a cone axis of rotation that is radially spaced from the bit axis and is substantially perpendicular to a plane containing the bit axis; and a plurality of circumferentially-spaced fixed blades (121; 122; 123), wherein each cone cutter includes a first plurality of cutter elements arranged in a first circumferential row extending about the corresponding cone axis of rotation, wherein each of the first plurality of cutter elements includes a planar cutting face that is configured to engage and shear the subterranean formation when the bit body is rotated about the bit axis in the cutting direction, characterised in that each fixed blade is integrally formed with the lower section of a corresponding one of the legs and extends radially outward from the lower section of a corresponding one of the legs, wherein each fixed blade has a radially outer formation-facing surface circumferentially disposed between the leading surface and the trailing surface of the corresponding leg, and the drill bit comprises a second plurality of cutter elements mounted to the formation-facing surface of each fixed blade and configured to engage and shear the formation when the bit body is rotated about the bit axis in the cutting direction.