Sweetbread is a culinary name for the thymus (also called throat, gullet, or neck sweetbread) or pancreas (also called stomach, belly or gut sweetbread), typically from calf (French: ris de veau) or lamb (ris d'agneau). The "heart" sweetbreads are more spherical in shape, while the "throat" sweetbreads are more cylindrical in shape. As the thymus is replaced by fibrous tissue in older animals, only pancreatic sweetbreads come from beef and pork. Like other edible non-muscle from animal carcasses, sweetbreads may be categorized as offal, "fancy meat", or "variety meat".