For a long time, scientists believed that the Giraffes were completely mute, producing some sounds only exclusively rarely, without any communicational purpose. But by the end of the previous millennium new discoveries were introduced: the giraffes are making sounds, only we don’t hear them.
The reason why we don’t hear them is because the sounds they make are just above the low limit of the human hearing range. An average human can perceive sounds between 20Hz and 20kHz, while the noises giraffes make are somewhere around 92Hz.
The answer of the question: “Why do giraffes make such low noises!?” can be found in their long neck. Because of their long neck, the air which “triggers” the vocal cords has much more space, and the sound produced becomes much deeper.
One significant benefit that the giraffes have by this phenomenon is the range that their noise covers. Lower frequencies travel further than higher, so if a group of giraffes spots some predator, they can signalize to the other giraffes at greater distance, thanks to the “quality” of the sounds they make.
Some other animals which, by evolution, developed similar communication systems using low frequencies include whales and elephants.
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