sentences:  All right whales have no ventral grooves; a distinctive head shape with a strongly arched, narrow rostrum, bowed lower jaw; lower lips that enfold the sides and front of the rostrum; and long, narrow, elastic baleen plates (up to nine times longer than wide) with fine baleen fringes.Rorquals are the largest group of baleen whales, with nine species in two genera.They include the largest animal that has ever lived, the blue whale.