infra-sound - silent roar


elephants can produce infra-sound with their trunks. these sounds can achieve the volume of the thunderclap, but are so deep that they cannot be heard by human beings. elephants receive these sounds from many kilometres away with the help of special cells in their legs and trunks. researchers have recorded these sounds with special microphones and have already identified several hundred different 'elephant words'- probably there are many more too. not only elephants, but also hippopotamuses, giraffes, and some species of whales communicate via infra-sound.

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