![Graphic][1] As the idiom puts it, beauty is in the eye of the beholder; but ears often get a look in too. Many species flaunt their charms with elaborate serenades… Click to show full abstract
![Graphic][1] As the idiom puts it, beauty is in the eye of the beholder; but ears often get a look in too. Many species flaunt their charms with elaborate serenades or gruff grunts to woo the opposite sex. Scientists have long known that the pitch of an animal's call is related to its size,
               
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