Giraffes are often thought of as mute animals, labeled as the “silent giants.” However, recent studies have debunked the myth. Giraffes can make noise and are more vocal than previously thought.

Does a Giraffe’s Neck Make it Silent?

Vocalization in mammals typically relies on the rapid movement of air through the vocal folds, causing them to vibrate and produce sound. A giraffe has a well-developed larynx, or voice box, which contains the vocal folds required for sound production. Therefore, it appear that they have the capacity for vocalization.

However, the mechanics of producing sound are where the challenges arise. Their long necks introduce significant biomechanical hurdles. The air must travel from the lungs to the vocal folds. This extended distance can reduce the velocity and pressure of the airflow. This less forceful airflow limits the range and volume of sounds giraffes can produce.

How Do Giraffe’s Communicate?

Giraffes evolved alternative methods of communication that do not rely heavily on vocal sounds. Their social interactions are often mediated through visual cues, such as body postures, neck movements, and subtle gestures, as well as through low-frequency sounds. These adaptations suggest that giraffes have shifted towards non-vocal forms of communication, possibly as a response to the anatomical constraints imposed by their long necks.

But, giraffes do produce a range of audible sounds.

Grunts and Snorts

Giraffes emit low-pitched grunts and snorts, particularly when they are alarmed or feel threatened. These sounds serve as warning signals to other members of the herd. The grunt is a short, guttural sound, while the snort is a sharp, forceful expulsion of air through the nostrils.

Hisses

When confronted with a threat, giraffes may hiss as a defensive mechanism. This sound is produced by forcibly exhaling air through their nostrils, creating a sharp and sudden noise intended to deter predators or rivals. The hiss is often accompanied by aggressive body language, such as neck swinging or leg stomping.

Moans and Grumbles

In moments of discomfort or frustration, giraffes can produce soft moans and grumbles. These sounds are generally subtle and serve as expressions of distress or irritation. For example, a giraffe may moan when being approached too closely by humans or other animals.

Hums

Giraffes produce humming sounds only during the night. The hums have a low frequency of approximately 92Hz, which is within the audible range for humans. The purpose behind these vocalizations is unclear. It is theorized that it could be a communicative signal, to stay connected to the group when visibility is limited.