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Gary Shannon wrote:
>A wildlife biologist I knew once worked in a major zoo near a sport 
>stadium, and was even able to identify a specific sound the chimps made 
>when and ONLY when the Goodyear blimp flew over. When she heard that sound 
>from them, she knew they were quite literally telling each other (and her) 
>that the blimp was in sight.
>
Was it by chance the same cry they used when they sighted a predator (e.g. 
an eagle) overhead??