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Do grey squirrels have different alarm calls?

Whilst in my local woods two buzzards flew over the top of the trees. Just as they did so a grey squirrel gave out an alarm call that was similar but different from the usual churring, cussing calls I'd heard them make.

Has any work been done to see whether grey squirrels have different calls related to different types of predators? I know that Vervet monkeys in Kenya have been shown to have different alarms for different kinds of predators ie, eagles, leopards and pythons.

Thanks,
Mike

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