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Animals security systems (Part 3/3)

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The first natural reaction to a strange sound is to sit still. Then common sense would advise turning back. A forbidden barrier had been crossed. The mixture of timbre, rhythm and volume in some sounds has the ability to attract attention. But they can seriously alter the mood of the listener. The alarms make us nervous. These sounds are repeated at appropriate intervals and the genes of all living beings able to hear react the same way. They stimulate the production of hormones that put us in a state of maximum attention!
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