Up until recently giraffes were thought to be mostly silent. They had been heard making grunting,snorting sounds but mainly their method of communication was undecipherable. A new study has revealed giraffes humming at night,it is not known if they are calling to lost or missing herd members or if the humming is more like snoring or a dog barking in its sleep. The sound is a deep and harmonic sustained sound. Before this discovery it was thought that the animals didn't vocalize because they couldn't get enough airflow in their six foot long necks.
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