The peacock worm (Sabella pavonina) is a marine polychaete worm belonging to the family Sabellidae. It occurs along the coasts of Western Europe and the Mediterranean. It is found in shallow, tidal waters with a bed of mud, sand or gravel. It is sometimes found on rocks or shipwrecks. It is 10-25 centimetres in length. Its body is elongated and divided into 100-600 small segments. The head has two fans of feathery tentacles arising from fleshy, semi-circular lobes.