대다수의 동물들은 목소리로 의사소통을 한다. 새는 지저귀고, 개구리는 울고, 고래들은 휘파람을 분다.
Many animals communicate vocally birds chirp, frogs thrum, whales whistle and comparing the nerve networks in a variety of vertebrates suggests that making sounds originated in ancient fishes, researchers report in Friday's edition of the journal Science.