Giraffes Hum At Night - Who Knew? | Audio + Video

Researchers studying vocal communication of Giraffa comelopardalis has revealed the species can deliver a harmonic, "sustained and frequency-modulated 'humming' during the night." These vocalizations could be a method of communication. But what they’re saying – or singing – is not yet understood; at least not by humans.

credit : Baotic A. et al., BMC Research Notes 2015/mash mix: Live Science