Humpback whales produce some of the most varied and haunting sounds in the animal kingdom, ranging from long, melodic sequences often described as “songs” to shorter grunts, squeaks, moans, and high-pitched cries used during everyday social interactions. The songs, performed almost exclusively by males, can last anywhere from a few minutes to over half an hour and carry through hundreds of miles of ocean. But the famous songs are only part of the story. Humpback whales also whisper to their calves, bark during competitive encounters, and constantly remix their vocal repertoire in ways that reveal a surprisingly rich acoustic culture.
The Sound of a Humpback Whale Song
If you were to drop a hydrophone into the water near a singing humpback, the first thing you would notice is the sheer range of what comes through. Some phrases are deep, resonant moans that vibrate in your chest even through headphones. Others are eerie, rising wails that climb in pitch over several seconds before dropping back down. Punctuating these are clicks, chirps, and what listeners sometimes call “trumpeting” sounds, which have an almost brassy, nasal quality. The overall effect is unlike any other animal vocalization: rhythmic and patterned, but also unpredictable enough to hold your attention.
The frequencies span a wide band. Low-frequency components can dip below 100 Hz, well into the range you would feel more than hear if you were in the water nearby. Higher-pitched elements can reach several thousand hertz. This mix of deep rumbles and sharper cries gives humpback songs their distinctive layered texture. To a human ear, they can sound alternately mournful, playful, and alien, sometimes within the same minute of recording.
How the Song Is Put Together
What makes humpback whale song particularly remarkable is not just the variety of sounds but how those sounds are organized. Researchers have long described humpback song as a hierarchically structured vocal display. The smallest building blocks are individual “units,” which are the discrete sounds a whale produces: a single moan, a cry, a series of clicks. Units get strung together into repeated sequences called phrases. Phrases are combined into themes, and themes are sung in a consistent order to make up a complete song.1Wiley Online Library. Humpback whale song hierarchical structure: Historical context and discussion of current classification issues
Think of it like music with verses and choruses. A whale might repeat one phrase pattern several times (the equivalent of a verse), shift into a new theme (a new verse with different melody), and cycle through multiple themes before eventually returning to the beginning and starting the whole song over again. A single rendition can last ten to thirty minutes, and some whales repeat their song for hours on end. The structure is consistent enough that researchers can transcribe it and compare songs across individuals and years, yet fluid enough that the content changes over time.
Not Just Songs
The famous songs get most of the attention, but humpback whales also produce a wide variety of non-song vocalizations that sound quite different. These social calls are shorter, less structured, and serve different purposes. They include low grunts, barks, and what researchers have described as “wops” and “thwops,” plus feeding-related calls that coordinate group behavior during bubble-net feeding. Some of these sounds are sharp and percussive; others are gentler and more tonal.
If songs are the equivalent of a musical performance, social calls are more like conversation: quick, functional, and context-dependent. A mother and her calf, for instance, exchange soft vocalizations that sound nothing like the elaborate male song. These calls were found to be produced at noticeably low amplitude, with received levels ranging from about 132 to 145 decibels, compared to the much louder songs produced by singing males, which registered above 165 decibels in the same study.2PeerJ. Social calls in humpback whale mother-calf groups off Sainte Marie breeding ground (Madagascar, Indian Ocean) For context, the difference between those levels in water is substantial. Mother-calf pairs appear to keep their communication deliberately quiet, and the prevailing explanation is that this reduces the risk of attracting predators or aggressive males to a vulnerable calf.
Why Males Sing
Only male humpback whales produce the elaborate, structured songs, and they do so primarily on breeding grounds or during migration toward them. The exact function of these songs has been debated for decades. Three hypotheses have received the most attention: that songs attract females to individual singers, that they mediate interactions between competing males, and that they draw females toward a broader male aggregation in a system resembling a lek, where males display in a shared area and females choose among them.3Wiley Online Library. The multiple functions of male song within the humpback whale (Megaptera novaeangliae) mating system: review, evaluation, and synthesis
The truth is probably some combination of all three, and the balance may shift depending on context. On a crowded breeding ground, song might function more as a male-to-male signal, establishing spacing or dominance without physical confrontation. In more dispersed settings, it could serve as a long-range beacon for females. What is clear is that the songs carry real social information. They are not random noise; whales adjust their singing based on who else is around, how far away they are, and what is happening socially in their vicinity.
You will sometimes hear it said that humpback whale songs are “love songs.” That framing is not entirely wrong, but it is oversimplified. A male singing on a breeding ground is doing something closer to a complex social broadcast: advertising his presence, his quality, and potentially his willingness to compete, all at once. The same song might attract a female, warn off a rival, and establish the singer’s position in a loose social hierarchy.
Songs That Travel Across Oceans
One of the most striking discoveries about humpback whale sound is that songs do not stay put. New song types spread between populations in a way that looks a lot like cultural transmission. In the South Pacific, researchers tracked song patterns across multiple populations over an eleven-year period and documented the rapid, repeated horizontal spread of new song types at the population level.4Current Biology. Dynamic Horizontal Cultural Transmission of Humpback Whale Song at the Ocean Basin Scale A novel song would appear in one population, then show up in neighboring populations to the east the following year, leapfrogging from group to group across thousands of miles of ocean.
The mechanism is probably straightforward: whales from different populations sometimes share migratory corridors or overlap on feeding grounds, and individuals pick up new material from whales they encounter. But the scale is astonishing. A song that originates off the east coast of Australia can end up being sung by whales near French Polynesia a few years later, having passed through several intermediate populations along the way. Each population does not simply adopt the new song wholesale, either. They modify it, blend elements of the old song with the new, and then pass that hybrid version along. The result is a continuously evolving acoustic culture, with song fashions sweeping across ocean basins in waves.
This is one reason why recordings of humpback whales from different decades can sound quite different from one another. The songs of the 1970s, made famous by Roger Payne’s groundbreaking recordings, are not what you would hear on a breeding ground today. The whales have been rewriting their material continuously ever since.
Mother-Calf Whispering
The quiet calls exchanged between mothers and calves deserve their own attention because they represent a completely different communication strategy from the booming songs of males. Where a singing male is essentially broadcasting to anyone within range, a mother and calf are doing the opposite: keeping their conversation as private as possible.
Studies using tags attached directly to whales have confirmed that mother-calf pairs vocalize at significantly lower levels than singing males.2PeerJ. Social calls in humpback whale mother-calf groups off Sainte Marie breeding ground (Madagascar, Indian Ocean) The sounds they make are soft grunts, squeaks, and tonal calls that would be inaudible from more than a short distance away. To a human listener, these calls sound intimate and gentle compared to the powerful songs of males. They are the acoustic equivalent of speaking in a low voice in a crowded room so that only the person next to you can hear.
The quietness is almost certainly an anti-predator strategy. Humpback whale calves are vulnerable to predation by orcas and large sharks, and a loud vocalization could advertise the pair’s location. By keeping their calls soft, mothers and calves maintain contact without drawing unwanted attention. When an escort male is present with the pair, vocalizations increase somewhat, suggesting that the social dynamics of the group influence how much sound is produced and at what volume.
How Noise Pollution Changes What Whales Can Hear
Humpback whales evolved their vocal strategies in an ocean that was far quieter than the one they live in today. The growing presence of commercial shipping, cruise ships, recreational boats, and industrial activity introduces chronic low-frequency noise into the same acoustic space whales use to communicate. The result is a phenomenon called masking: background noise drowns out or reduces the effective range of whale vocalizations, making it harder for animals to hear each other.
Research in Glacier Bay National Park in Alaska quantified the extent of this problem. Typical summer vessel traffic in the park caused substantial losses to the communication space available to marine mammals. For singing humpback whales, the effective area over which their songs could be detected was reduced by roughly 13 to 28 percent. For whales making social calls, the reduction was even worse, ranging from 18 to 51 percent. Harbor seals in the same area lost 32 to 61 percent of their communication space for roaring calls.5National Park Service. Managing Underwater Noise Pollution These losses were most severe during daylight hours and persisted even in the absence of cruise ships, meaning that routine boat traffic alone was enough to significantly shrink the acoustic world available to these animals.
For humpback whales, this is not a trivial inconvenience. If a male’s song cannot travel as far because of background noise, fewer females and fewer rival males will hear it, potentially altering mating dynamics. If a mother-calf pair’s already-quiet calls are further masked by engine noise, the pair may need to vocalize more often or at higher amplitudes, which could increase their exposure to predators. Some researchers have observed whales adjusting their vocal behavior in noisy environments, singing louder or shifting the timing of their calls to avoid the noisiest periods, but these compensatory strategies have limits.
What You Can Actually Listen To
If you want to hear humpback whales for yourself, recordings are widely available and genuinely worth seeking out. The original 1970 album “Songs of the Humpback Whale,” produced by Roger Payne and released by National Geographic, was one of the best-selling nature recordings ever made and is credited with helping spark the global movement to ban commercial whaling. Those recordings still hold up as remarkable listening, though they capture only a snapshot of what humpback songs sounded like at that particular moment in their cultural evolution.
Modern recordings, made with higher-fidelity equipment and often available online through research institutions and ocean observatories, capture a richer range of sound. Some hydrophone networks stream live audio from the ocean, and during breeding season you can sometimes catch a singing male in real time. Listening through good headphones is the best way to appreciate the full frequency range, especially the deep, resonant low notes that get lost through laptop speakers.
What surprises most first-time listeners is how musical the songs sound. The phrasing, the repetition, the way themes build and resolve: it does not sound random, and it is not. These are highly structured, culturally transmitted vocal performances that change over time and spread across populations spanning entire ocean basins. Whether that qualifies as “music” in any formal sense is a philosophical question, but to the human ear, the resemblance is hard to ignore.
Sounds Beyond the Vocal
Humpback whales do not communicate only through their voices. They are among the most physically demonstrative of all whale species, and many of their surface behaviors produce sounds that carry underwater. Breaching, where a whale launches most of its body out of the water and crashes back down, generates a thunderous boom that can be heard for miles through the water column. Pectoral fin slapping and tail slapping produce sharp, percussive cracks that are thought to serve as attention-getting signals or expressions of excitement and agitation.
These non-vocal sounds are louder and more broadband than most social calls, and they may serve a communication function when vocal signals are not getting through. Some researchers have noted that surface-active behaviors increase in windy conditions, when wave noise makes it harder for low-amplitude vocalizations to be heard. A 40-ton animal smashing back into the ocean from a height of several meters is hard to miss, acoustically speaking, regardless of background noise levels. Whether whales consciously use these physical sounds as a backup communication channel or whether the correlation is coincidental remains an open question, but the sounds themselves are a real and prominent part of the humpback acoustic environment.