What Noise Does A Giraffe Make

They make way more noise than anyone expects

Giraffes are not silent animals. The old zoo fact that they are the quietest mammal is just wrong and has been repeated so many times it became cultural knowledge despite being inaccurate. They produce a range of vocalizations that most people never hear because they are low-frequency and mostly or in open habitat where there is nobody around to listen. I spent a few seasons doing acoustic monitoring near a giraffe population in southern Kenya, setting up passive recorder arrays along water points. The first thing that surprised me was how much audio data we actually captured. The second thing was how little of it fell within the range of human hearing without some processing. What happens when you lower the pitch of those recordings by an octave or two is that the giraffes sound almost completely different from what you imagine a 1,800-pound browser would sound like.

What Noise Does A Giraffe Make

The common vocalizations break down into a handful of categories, each with a specific context. Hums are the big one researchers found recently and the one that changes everything about how we think about their communication. Adult giraffes, mostly females, produce low-frequency humming sounds during nighttime hours. These are continuous tonal vocalizations that can last several minutes, and the pitch sits around 92 Hertz on average, which is close to the lower limit of human hearing. A human ear will barely detect it unless the animal is within roughly 50 meters and the ambient noise is minimal. Flute-like sounds are another category. These are higher-pitched than the hums and tend to come from younger animals or during close social interactions. They resemble a soft whistling tone and are typically 300 to 600 Hertz. Sirens are the dramatic ones. When a giraffe feels threatened or is in genuine distress, it produces a piercing siren call that can reach above 2,000 Hertz. This is the sound people are most likely to have accidentally heard without realizing what it was. It cuts through wind and vegetation noise quite effectively, which makes evolutionary sense given their open habitat. Grunts and snorts cover the routine maintenance sounds. Feeding grunts happen when they are browsing, especially when competing with other giraffes over a branch. Snorts are short exhalations used as proximity signals between individuals walking together. Hisses appear when they are agitated by something close, usually predators or human observers getting too near. Bleats come almost exclusively from calves and sound remarkably similar to goat bleats, which is not coincidental given that both are caprine-adjacent in behavior even though giraffes are more closely related to cows.

I once had a field assistant insist we had recorded a wild dog vocalization near our northernmost recorder site. We spent two days cross-referencing spectral patterns before confirming it was a subadult male giraffe producing a sirens call during a brief altercation over browsing space. The frequency overlap between adolescent giraffe sirens and African wild dog alarm calls is significant enough that even experienced bioacousticians can confuse them on first listen. The workaround I settled on was looking at the harmonic structure. Giraffe sirens have a cleaner fundamental with fewer overtones, while wild dog vocalizations are more chaotic and broadband. Checking the spectrogram for that pattern difference resolves the ambiguity in about 30 seconds once you know what to look for. Below 20 Hertz, giraffes also produce infrasonic vocalizations that are essentially felt rather than heard. Research from Oxford and Vienna tracking GPS-collared individuals with synchronized audio recorders found that they communicate at these frequencies over distances of several kilometers. The practical implication is that a herd spread across a large reserve can maintain cohesion without any individual ever producing a sound a human could detect. This is probably the most important finding in recent giraffe bioacoustics and it explains why observers who only rely on audible sound consistently underestimate their vocal activity. The misconception that giraffes are nearly silent exists because early field biologists did not have the recording equipment to capture low-frequency and infrasonic sounds. They walked through habitat during daytime hours and heard nothing, so they concluded there was nothing to hear. Modern broadband hydrophones and specialized low-frequency microphones have changed that picture completely. If you want to actually hear what giraffes produce without investing in research-grade gear, you can download free spectrogram analysis software like Audacity and apply a low-pass filter set between 50 and 500 Hertz to any field recordings you find online. The hums become audible very quickly once you shift the frequency range down enough.

One thing to be careful about is that not all low-frequency rumbling near giraffe habitat is giraffe vocalization. Elephants produce infrasound that overlaps substantially with giraffe infrasonic calls, and the spectral difference between the two requires careful examination of the modulation pattern. Elephant rumbles are more regularly pulsed, while giraffe infrasonic calls tend to be more continuous and tonal. If you are analyzing your own recordings and need to distinguish them, focus on the pulse repetition rate and the stability of the fundamental frequency over time. Giraffe calls hold their pitch more steadily than elephant rumbles do. The humming behavior especially has implications for conservation monitoring. Acoustic surveys using automated call detection algorithms can now estimate giraffe density in areas where visual surveys are impractical due to dense vegetation or difficult terrain. This is still a developing methodology and the detection rates vary significantly depending on habitat acoustics and distance from the recorder. It works best in open woodland and savanna with minimal wind noise, and the effective detection radius for nighttime humming appears to be roughly 200 to 400 meters under ideal conditions. In thick bush or during windy nights, that radius shrinks considerably and visual counts remain the more reliable option. So to answer it directly: a giraffe makes hums, flute sounds, sirens, grunts, snorts, hisses, and bleats, with a significant amount of infrasonic communication happening below the threshold of normal hearing. They are far from silent and their vocal repertoire is more diverse than most field guides give them credit for. The humming particularly is a behavior that was only documented in 2015 and fundamentally changed the understanding of how these animals interact socially. Most people will go their entire lives without hearing any of it because the frequencies are too low or the timing is wrong, but the recordings are there if you know where to listen.