You’re standing in the middle of the African savanna, or maybe just a quirky farm in the Midwest, and you hear it. A low, vibrating thrum that feels more like a heavy engine idling than anything coming from a bird’s throat. It’s a sound that rattles your chest. Most people imagine a giant bird would chirp, squawk, or maybe honk like an over-sized goose. They're wrong. When you ask what sound does an ostrich make, you aren't looking for a melody. You're looking for a roar.
Seriously.
Male ostriches don't sing; they boom. It is a hollow, haunting noise that sounds remarkably like a lion’s roar from a distance. If you were trekking through the bush at dusk and heard that three-part "hoo-hoo-hooo," you’d probably start looking for the nearest tree to climb, thinking a predator was on your tail. But it’s just a seven-foot-tall bird with long eyelashes and a very loud message for his neighbors.
The Science of the Boom: Why They Sound Like Lions
The "booming" call is the most iconic sound in the ostrich repertoire. It’s almost exclusively the domain of the males. During the mating season, or when they feel their territory is being encroached upon, they inflate their necks to nearly double their normal size. This isn't just for show. The neck acts as a resonance chamber. They push air from their lungs into the esophagus, which balloons out, creating a deep, low-frequency sound.
It’s physics, basically.
A longer neck and a larger air sac mean a lower pitch. Because the sound is so low-frequency, it travels incredibly well across open plains. This is a survival tactic. In the vast stretches of the Serengeti or the Kalahari, a high-pitched tweet would get lost in the wind. A low-frequency rumble carries for miles. Researchers have noted that this sound typically consists of three parts: two short booms followed by one long, drawn-out groan. It’s rhythmic. It’s deliberate. And honestly, it’s a bit intimidating if you’re standing right next to it.
But why the lion resemblance? Evolutionary biologists have debated this for years. Some suggest it’s a form of acoustic mimicry—sounding like a predator to keep other animals at bay—though most experts, like those at the San Diego Zoo, lean toward the idea that it’s simply the most efficient way to communicate over long distances in that specific environment. It’s a "keep out" sign made of air and feathers.
It’s Not Just Booming: The Hiss and the Grunt
If the boom is the ostrich’s long-distance radio, the hiss is their "get out of my face" alarm. If you ever find yourself too close to an ostrich—which, for the record, is a bad idea considering their kick can kill a lion—you will hear the hiss. It’s sharp. It’s sudden. It sounds like air escaping a high-pressure tire.
They do this when they’re angry. Or frustrated. Or just generally "done" with your presence.
While the males are the loud ones with the booming calls, both sexes are proficient hissers. It’s a universal language of "back off." Unlike the complex vocalizations of songbirds, the ostrich doesn't have a syrinx—the avian version of a voice box—that is as sophisticated as a nightingale’s. Instead, they rely on moving massive amounts of air through their throat.
Then there’s the grunting.
Ostriches grunt when they’re moving around or interacting with their chicks. It’s a much more domestic sound. It’s functional. When a mother ostrich is herding her "crèche" (a group of chicks from multiple parents), she uses soft guttural sounds to keep them in line. It’s a far cry from the terrifying roar of the male, showing that the answer to what sound does an ostrich make depends entirely on who the bird is talking to and how they’re feeling that day.
The Silent Giants? Not Quite
There is a weird myth floating around that ostriches are silent. This probably comes from the fact that in captivity, without the pressure of predators or the need to find a mate across ten miles of scrubland, they don't have much to say. They can be very quiet. You might spend all day at a zoo and never hear a peep.
But silence is a choice, not a biological limitation.
Chicks are actually the most vocal members of the species. From the moment they hatch, they emit a high-pitched, melodic trill. It’s almost sweet. They use these sounds to tell their parents they’re lost, hungry, or scared. As they age, this trill deepens and eventually disappears, replaced by the more "industrial" sounds of the adult ostrich.
Breaking Down the Vocal Range
- The Boom: Reserved for males. Used for territory and mating. Sounds like a lion or a foghorn.
- The Hiss: Used by both sexes. Indicates aggression or defense. Very loud and sudden.
- The Grunt: Used during social interaction or when the bird is startled.
- The Chirp/Trill: Specific to chicks. Used to maintain contact with parents.
- The Snort: Often heard during displays of dominance.
Why the "Lion Roar" Confuses People
It's actually a common trope among safari guides to let tourists guess what animal is making that noise. Most people guess a big cat. When the guide points to a bunch of feathers in the distance, the reaction is usually disbelief. The acoustic similarity is striking.
If you look at the frequency charts, a lion's roar and a male ostrich's boom occupy a very similar space on the spectrum. Both are designed to vibrate through the air and even the ground. This "infrasound" quality means you sometimes feel the sound before you consciously "hear" it. It’s a primitive, gut-level reaction.
Communication Beyond Sound
We can’t really talk about ostrich sounds without mentioning that they are also big on visual cues. Since their "vocal cords" are limited, they supplement their booms with elaborate dances. A male ostrich will drop to his knees, wings spread wide, and rock from side to side. He’ll wave his white feathers like flags.
This is called "kantling."
It’s often done in total silence or accompanied by the low-frequency booming. The combination of the visual "flashing" of white feathers against their dark bodies and the physical vibration of the boom is a sensory overload for any female ostrich in the vicinity. It’s an all-encompassing performance. If the boom is the song, the kantling is the music video.
Common Misconceptions About Ostrich Noises
One of the biggest mistakes people make is thinking that ostriches make "bird-like" noises. They don't. You won't hear a "caw" or a "cluck." Their sounds are much more mammalian in nature. Because they are ratites—a group of flightless birds that includes emus and kiwis—their anatomy is different from the birds you see at your birdfeeder.
Another misconception? That they bury their heads in the sand when they’re scared (and maybe make muffled noises while doing so). They don't do that. They might lay their heads flat on the ground to blend in with the landscape, but their heads remain firmly above the dirt. When they do this, they are usually silent, relying on camouflage rather than vocalization to stay safe.
Understanding the "Drumming" Sound
Sometimes, you’ll hear people describe the ostrich sound as "drumming." This usually refers to the rapid-fire vibration of the air sac. It’s a rhythmic, thumping noise. In certain regions of South Africa, farmers who raise ostriches for leather or feathers have to get used to this constant thrumming during the spring months. It becomes background noise, like living near a train station.
It’s also worth noting that ostriches are highly reactive. If they hear a sound they don't like—like a car engine or a barking dog—they might respond with a "snort-hiss" combo. It’s a quick, sharp expulsion of air that says, "I see you, and I’m not happy about it."
Why Do You Need to Know This?
Whether you’re a bird enthusiast, a student, or someone planning a trip to a wildlife preserve, understanding the vocalizations of the world’s largest bird helps you read their behavior. If you hear a hiss, you move away. If you hear a boom, you appreciate the power of nature from a safe distance.
The ostrich is a relic of an older world. Their sounds reflect that. They aren't refined or musical; they are raw, powerful, and functional. They are the sounds of a bird that has survived for millions of years by being too big to ignore and too loud to miss.
Practical Tips for Identifying Ostrich Sounds in the Wild
- Listen for the "Third" Note: A lion's roar usually tapers off into several short grunts. An ostrich's boom usually ends with a long, sustained note.
- Check the Time: Ostriches are most vocal at dawn and dusk. This is when the air is stillest, allowing their low-frequency calls to travel the furthest.
- Watch the Neck: If you see a male ostrich with a bright red neck that looks inflated like a balloon, he’s about to boom. Cover your ears if you’re close.
- Don't Mimic Them: Seriously. Mimicking a male's boom can be interpreted as a challenge. You do not want to challenge a 300-pound bird that can run 45 miles per hour.
When you finally hear it in person, the answer to what sound does an ostrich make becomes less of a trivia fact and more of an experience. It’s a sound that reminds you that birds are, at their core, living dinosaurs.
Next Steps for Bird Enthusiasts
If you're fascinated by the weird world of ratite vocalizations, your next move should be comparing the ostrich boom to the emu "drum." While ostriches use their esophagus to create sound, emus have a specialized tracheal pouch that creates a distinct "donk-donk" noise. Observing these differences in person at a reputable sanctuary or through high-quality field recordings can give you a much deeper appreciation for how flightless birds have adapted their communication styles to survive in vastly different environments across the globe. Grab a pair of decent headphones and look up "male ostrich booming" on a nature archive—just don't be surprised if your subwoofer starts shaking.