The results also suggested beaked whales (Ziphiidae) and bowhead whale (Balaena mysticetus) had a relatively closer affinity. 分析还提示喙鲸与须鲸类的弓头鲸具有较近的亲缘关系。
The beak, bill, or rostrum is an external anatomical structure of birds which is used for eating and for grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young. The terms beak and rostrum are also used to refer to a similar mouthpart in some Ornithischian dinosaurs, monotremes, cephalopods (see Cephalopod beak), cetaceans, billfishes, pufferfishes, turtles, Anuran tadpoles and sirens.