书城外语课外英语-动物亮丽风景线(双语版)
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第77章 聒噪的爬行动物

Alligators and crocodiles make all kinds of sounds.They hiss softly.They make fearsome roars and bellows.Males roar and bellow loudest during the mating season.Scientists don’t know exactly what the roars mean.Maybe the males are trying to call females.Maybe they are trying to scare other males away.

Swimming and Walking