On the Occurrence and Significance of Motivation-Structural Rules in Some Bird and Mammal Sounds

摘要: The convergent use of harsh, low-frequency sounds by hostile animals and more pure tonelike, high frequency fearful or appeasing is discussed in an evolutionary context. It proposed that many species' repertoires are evolved from motivation-structural rules derived selection pressures favoring the communication instead of, conjunction with, fighting to attain resources. this concept should further appreciation relationship between sound structure function.