by Laura Geggel, Staff Writer | September 24, 2015 07:13am ET
Dogs bark, sheep bleat and mice squeak, but what sounds do giraffes make?
They hum, but only during the nighttime, a new study finds.
According to audio recordings of giraffes taken at three European zoos, the long-legged animals sometimes produce "a low-frequency vocalization with a rich harmonic structure and of varying duration" at night, the researchers wrote in the study.
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