A horned owl that lives in a narrow strip of high-Andean grassland in northern Peru has been confirmed as a species new to science. Named Bubo jalca, the bird is essentially identical to its closest relative in plumage and body size, and researchers only recognized it as distinct after analyzing its call. The description rests on a single female specimen collected decades ago and on sound recordings that took years to match to a living population. Because its range is so restricted, the newly named owl already faces conservation concerns tied to habitat loss.
A Habitat Wedged Between the Páramo and the Puna
Bubo jalca belongs to the genus Bubo, a group of more than ten species that includes American horned owls and Old World eagle-owls. It inhabits the jalca, a cold, high-elevation grassland and cloud-forest habitat restricted to the Huancabamba Depression, a geographic dip in the Peruvian Andes that separates the páramo ecosystem to the north from the puna grasslands to the south. Rather than turning up in either of those better-known habitats, the newly described owl is confined to the transition zone between them, a narrower and less-studied strip of terrain than the ecosystems it divides.
A Species Defined by Its Voice, Not Its Feathers
In plumage and body measurements, Bubo jalca is essentially indistinguishable from its closest relative, Bubo nigrescens, which lives in páramo habitat in Ecuador and Colombia. What sets the new species apart, according to the researchers who described it, is its call. Armando Ugaz Cherre, an ornithologist at the Universidad Nacional de Piura, and colleagues in Argentina and Peru wrote that “its call is distinguishable both aurally and by phrase structure on spectrograms and oscillograms and is therefore diagnostic.”
Comparing Calls Across Three Andean Owls
The team described Bubo jalca as uttering a rapid “jé-cu!” with emphasis on the first syllable. That is a distinct pattern from the prolonged, trisyllabic “cus-cún-go” call of male Bubo nigrescens, which stresses the middle syllable, and from the rapid, bisyllabic “tu-cú” produced by both sexes of Bubo magellanicus. Spectrogram and oscillogram analysis, visual representations of a sound’s frequency and amplitude over time, let the researchers show that the difference is consistent rather than incidental, which is what allowed them to justify naming a new species from birds that look nearly identical to an existing one. Owls are split into cryptic species this way more often than most bird families, since their nocturnal habits make plumage differences hard to judge reliably in the field, while a call can be recorded, measured, and compared with far less ambiguity.
A 1980 Specimen Waits Decades for a Name
The formal description of Bubo jalca is based on a female specimen collected in July 1980 near Cruz Blanca, about 33 kilometers by road southwest of Huancabamba, at roughly 3,050 meters elevation. The specimen has been held at the Louisiana State University Museum of Natural Science since then, and matching sound recordings of the same individual are archived at the Macaulay Library at the Cornell Lab of Ornithology. The gap between collection and formal recognition reflects how much unrecognized diversity can sit in museum drawers until someone re-examines the material with new tools, in this case bioacoustic analysis rather than a fresh expedition. Natural history collections built up over the past century routinely hold specimens gathered long before DNA sequencing or spectrogram software existed, and species like Bubo jalca are as likely to be found inside a museum cabinet as in the field.
Why No Photograph of the Bird Exists
Ugaz Cherre and colleagues noted that “Bubo jalca is a particularly rare taxon, or at least a very scarce one, within its area of occurrence: the jalca and the adjacent cloud forest.” They added that “to date, no photographs of the species are known, an indirect reflection of its singularity.” The absence of any photograph, decades after the type specimen was collected, underscores how seldom the bird is encountered even by researchers who work in the region, and how much of its basic biology, from nesting habits to lifespan, remains undescribed.
Pine Plantations and Cloud-Forest Loss Threaten a Narrow Range
The researchers describe Bubo jalca as facing serious conservation threats because of its narrow range. They point to the expansion of pine plantations into jalca grassland and to deforestation of the adjacent cloud forest as the two pressures most likely to affect the species. “Bubo jalca is considered to face serious conservation threats as an extremely range-restricted species, whose persistence depends not only upon the jalca (recently undergoing an accelerating invasion by pine plantations), but also upon the adjoining cloud forest, itself under imminent threat of deforestation,” they concluded. The formal description was published in the journal Audiornis in July 2026, giving conservation groups a named, documented species to work from rather than an unrecognized population folded into a more common owl’s range.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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