The “devil bird” is a creature from Sri Lankan folklore whose terrifying nocturnal screams were long believed to foretell death. Far from being purely mythical, the bird behind the legend is almost certainly real. Most ornithologists point to the Spot-bellied Eagle-Owl (Ketupa nipalensis), a large, elusive forest owl whose territorial calls can sound disturbingly like a human shrieking in the dark. The story of the devil bird sits at the intersection of genuine animal behavior, cross-cultural superstition about birds and death, and the ecology of a poorly understood raptor.
The Sri Lankan Legend of the Ulama
In Sinhala, the devil bird is called the “ulama,” a name that roughly translates to “the one who screams.” Sri Lankan tradition holds that hearing its cry at night is a harbinger of death, either for the listener or for someone nearby. The legend has deep roots in rural communities, particularly in the island’s forested interior, where the cry was most often reported. Villagers described a sound so unsettling that it could freeze a person in place: a wail that rose and fell, sometimes resembling a woman screaming in agony, sometimes closer to a child’s desperate cry.
When British colonial naturalists arrived in Sri Lanka during the 19th century, they encountered the legend repeatedly. Several attempted to identify the bird responsible, but accounts were confused by the fact that multiple nocturnal species inhabit Sri Lanka’s forests. Over the decades, a few candidates were proposed, including the Sri Lanka Highland Nightjar and the Brown Wood Owl. But the call most consistently described in devil bird accounts, a loud, drawn-out shriek rather than a hoot or whistle, matched one species better than the rest.
The Bird Behind the Cry
The Spot-bellied Eagle-Owl is one of the largest owl species in Asia, standing roughly 50 to 60 centimeters tall with prominent ear tufts and striking dark eyes. It is a powerful predator that hunts in dense evergreen and semi-evergreen forests, taking prey as large as hares and pheasants alongside the usual rodents and smaller birds. The species ranges across a broad swath of southern and southeastern Asia, from the Himalayan foothills through the forests of India, Sri Lanka, Nepal, Myanmar, Thailand, and parts of southern China.
What makes this owl the leading devil bird candidate is its voice. Unlike the familiar hooting of many owl species, the Spot-bellied Eagle-Owl produces a loud, eerie scream that carries over long distances in forested terrain. The call has been described by field ornithologists as startlingly human-like, a quality that would have been amplified for anyone hearing it alone in a dark forest. The bird is also deeply nocturnal and secretive. Sightings in the wild are rare even for experienced birders, which fits neatly with the legend of a creature more often heard than seen.
The species’ life history has been summarized by the Cornell Lab of Ornithology, covering its identification, habitat, diet, vocalizations, breeding ecology, and conservation status, though much remains poorly documented due to the owl’s reclusive habits.1Birds of the World (Cornell Lab of Ornithology). Spot-bellied Eagle-Owl (Ketupa nipalensis) The difficulty of observing this bird in its dense forest habitat has meant that even basic questions about its population size and behavior remain only partially answered.
Why the Call Sounds So Disturbing
There is a reason that a screaming bird in the dark triggers a visceral response: your brain is built to react to sounds that resemble human distress calls. Research on how people perceive screams has found that alarm screams, those conveying pain, anger, or fear, are rated as significantly more alarming than non-alarm screams conveying emotions like joy or sadness.2PLoS Biology. Neurocognitive processing efficiency for discriminating human non-alarm rather than alarm scream calls What makes this relevant to the devil bird is that the Spot-bellied Eagle-Owl’s call occupies a pitch and tonal range that overlaps with human alarm vocalizations, precisely the sounds our brains are wired to treat as urgent threats.
Counterintuitively, the same study found that people were actually worse at distinguishing between different types of alarm screams than they were at telling apart non-alarm screams. In other words, your brain prioritizes speed over precision when it hears something that sounds like a scream of fear or pain. It reacts first and sorts out the details later. For a villager in a Sri Lankan forest hearing the owl’s cry for the first time, this processing bias would have made the sound feel immediately and unmistakably threatening, even before any cultural belief about death omens entered the picture.
This phenomenon is sometimes described as a form of auditory pareidolia, the tendency to perceive meaningful patterns in ambiguous sounds, similar to how people hear words in white noise or see faces in random patterns. When the raw sound is close enough to a human scream to trigger the brain’s alarm circuits, the listener’s mind fills in the rest. Cultural context then provides the interpretation: in Sri Lanka, that meant death was coming.
How Breeding Season Shapes Owl Calls
One puzzling aspect of the devil bird legend is that the cries were not reported consistently year-round. Some accounts described seasonal periods when the screams were especially frequent, followed by months of silence. This pattern aligns with what researchers have learned about how owls modulate their vocal behavior based on breeding status.
A study of spotted owls found that breeding status significantly shapes how often and how loudly owls call. Breeding owls that had successfully fledged young produced fewer territorial calls, called more quietly, and used a less diverse vocal repertoire compared to non-breeding individuals. Males were generally more likely to engage in territorial calling than females. Non-breeding owls, by contrast, maintained larger territories with more vigorous vocal defense.3Journal of Avian Biology. Breeding status shapes territoriality and vocalization patterns in spotted owls The researchers suggested that breeding owls reduce their investment in noisy territorial behavior to avoid drawing predators toward their nests and young.
While this particular study focused on a different owl species, the underlying logic applies broadly. If Spot-bellied Eagle-Owls follow a similar pattern, their haunting territorial screams would peak during non-breeding periods or early in the breeding season when pairs are establishing territory, then taper off as nesting gets underway. That would produce exactly the kind of unpredictable, seasonal pattern that feeds a legend: the screams come and go without obvious cause, making them seem deliberately ominous rather than biologically routine.
Birds as Death Omens Across Cultures
Sri Lanka is not the only culture that has turned a bird’s cry into a death omen. Across the world, birds represent the single largest category of superstitions predicting death. A study comparing death omens across English, Russian, and Mari folk traditions found that bird-related omens outnumbered all other categories, with English folklore alone containing 31 distinct bird-related death superstitions.4Academia.edu. Death Omens in the Superstitions of the English, Russian, and Mari Languages
Certain omen themes turned up in all three language traditions: birds flying into a house, black ravens, singing cuckoos, and sparrows were universal death predictors, alongside non-bird omens like howling dogs and falling stars.4Academia.edu. Death Omens in the Superstitions of the English, Russian, and Mari Languages The pattern is remarkably consistent. Owls feature prominently in European, Middle Eastern, and South Asian death-omen traditions. In ancient Rome, an owl’s cry near a home signaled impending doom. In parts of India beyond Sri Lanka, certain owl species are still considered bad luck. The Barn Owl, with its ghostly white face and harsh shrieking call, plays a similar role in English and Welsh folklore.
Why birds? Several features make them natural candidates for supernatural interpretation. They appear and disappear unpredictably. Their calls pierce the night without a visible source. Many species are active precisely when humans feel most vulnerable: after dark, in storms, during the hours when sick or elderly people are statistically more likely to die. The devil bird legend follows this template almost perfectly, but with a call so uniquely unsettling that it generated a more specific and persistent tradition than most.
Range Discoveries Still Happening
Despite being known to science since the 19th century, the Spot-bellied Eagle-Owl keeps turning up in places where it was not previously documented. In 2024, researchers recorded the first photographic evidence of the species in Palamau Tiger Reserve in Jharkhand, India. This represented a significant westward range extension, with the nearest previously documented populations located 250 to 550 kilometers away in the states of Odisha and West Bengal.5Journal of Threatened Taxa. First photographic evidence of Spot-bellied Eagle Owl Ketupa nipalensis in Palamau Tiger Reserve, Jharkhand, India
The same report noted that multiple records from Madhya Pradesh suggest the owl has an established but poorly documented presence across central India.5Journal of Threatened Taxa. First photographic evidence of Spot-bellied Eagle Owl Ketupa nipalensis in Palamau Tiger Reserve, Jharkhand, India In practical terms, this means the bird’s actual range is likely larger than what official maps show. For a nocturnal species that lives in dense forest and rarely makes itself visible, this is not surprising, but it does raise interesting questions. If the owl has quietly occupied forests across a broader area than previously known, the devil bird legend may have had more geographic reach in its original form than researchers assumed. Communities in central India have their own traditions of ominous nocturnal birds that may trace back to the same species.
Threats to the Real Devil Bird
The Spot-bellied Eagle-Owl faces a familiar list of threats. Habitat loss from logging and agricultural expansion is the most significant, since the species depends on large tracts of mature forest. Pesticide use, vehicle collisions, and illegal trapping for the wildlife trade also contribute to population declines.6Indian BIRDS. Sighting of Spot-bellied Eagle Owl Bubo nipalensis in Ramnagar Forest Division, Uttarakhand, India Because the bird is so difficult to survey, population estimates are rough at best, and localized declines could go unnoticed for years before showing up in broader assessments.
The irony of the devil bird’s cultural status is that superstition has cut both ways for its conservation. In some communities, the belief that the bird’s cry brings death has led people to fear and avoid it, which inadvertently protected it from direct persecution. In other areas, the same fear has motivated people to kill the bird or destroy nest sites in an attempt to rid their village of the omen. As forest cover shrinks and rural communities modernize, neither the protective nor the destructive superstition carries much influence anymore. The owl’s fate now rests mostly on conventional conservation challenges: whether enough forest habitat remains and whether the species gets adequate legal protection.
Modern Acoustic Tools and the Search for Secretive Species
One of the reasons so little is known about the Spot-bellied Eagle-Owl’s distribution and behavior is that studying a rare, nocturnal, forest-dwelling bird is genuinely hard. You cannot easily census a species that hides all day and calls unpredictably at night in dense canopy. This is where passive acoustic monitoring, or PAM, has started to change the game. Researchers place arrays of microphones in the field to record continuously, collecting months of audio data that can later be analyzed for target species’ calls.
The approach has seen a dramatic rise in use for biological and ecological applications in recent years. But the volume of data generated has become a challenge of its own. Datasets are often so large that manual analysis is unrealistic, and one of the biggest barriers to wider adoption is the gap between the expertise of field biologists and the machine-learning skills needed to build automated detection systems.7PubMed Central. Automatic detection for bioacoustic research: a practical guide from and for biologists and computer scientists
Automated call-detection systems have already been developed and tested for other loud, distinctive tropical birds. Work on the Screaming Piha, a neotropical species whose call is one of the most recognizable sounds in South American rainforests, demonstrated that spectrogram-based detection systems could achieve high accuracy in identifying calls from continuous field recordings made with multi-microphone arrays.8Ecological Informatics. Screening large audio datasets to determine the time and space distribution of Screaming Piha birds in a tropical forest Similar approaches could, in principle, be applied to the Spot-bellied Eagle-Owl, whose powerful and distinctive scream is well suited to automated detection. A sustained acoustic monitoring effort across the owl’s range could reveal populations that have gone unnoticed, clarify seasonal calling patterns, and provide the baseline data needed to track population trends over time.
Other “Devil Birds” Around the World
Sri Lanka’s ulama is the most famous devil bird, but it is far from the only nocturnal species that has earned a supernatural reputation. The Common Potoo of Central and South America produces a mournful, descending wail that indigenous communities across the Amazon Basin have associated with spirits of the dead. The Curlew’s eerie night cry was considered an omen of death in parts of Britain and Ireland well into the 20th century. Australia’s Powerful Owl and the Tawny Frogmouth have both featured in Aboriginal Australian stories about night spirits.
What connects all of these traditions is the same set of ingredients: a bird that is heard far more often than it is seen, a call that carries emotional weight due to its pitch or tonal quality, and a cultural framework that interprets unexplained nocturnal sounds as messages from the supernatural world. The Spot-bellied Eagle-Owl stands out in this group because its call is arguably the most convincingly human-like of any bird species, and because the devil bird tradition in Sri Lanka is unusually specific and persistent compared to the more diffuse omen beliefs attached to owls and nightjars elsewhere. Whether the owl deserves its sinister reputation is beside the point for the people who grew up hearing the stories. For them, the sound itself carries the meaning, and no amount of ornithological identification can entirely strip a scream in the dark of its power to unsettle.