The Rediscovery of the Black-Naped Pheasant-Pigeon After 126 Years: A Scientific Breakthrough Linking Indigenous Knowledge and Camera Traps
- 演化之聲
- Mar 12
- 6 min read
On Fergusson Island in eastern Papua New Guinea, a bird species had quietly vanished from scientific view for 126 years. The Black-Naped Pheasant-Pigeon (Otidiphaps insularis), a large terrestrial pigeon, was once treated as a subspecies of Otidiphaps nobilis but has recently been recognized as a distinct species. With its unusual appearance and elusive behavior, it is now listed by the International Union for Conservation of Nature (IUCN) as Critically Endangered and is the only terrestrial bird in New Guinea to hold this status. For decades many researchers feared that it might already be extinct. Yet a collaborative effort combining indigenous knowledge with modern scientific monitoring has finally confirmed that the species still survives.
During a month-long expedition in 2022, researchers conducted interviews, questionnaires, camera trapping, and field bird surveys across Fergusson Island. After more than a century without confirmed documentation, the team successfully captured images of the bird. The rediscovery represents not only a major biological finding but also a powerful example of what can be achieved when scientific methods intersect with local ecological knowledge.
The Black-Naped Pheasant-Pigeon was first collected in 1882 by the British naturalist Andrew Goldie and later again in 1896 by Albert Meek. After that second collection, the species disappeared entirely from the scientific record. Because only a handful of specimens existed and field surveys were extremely limited, researchers estimated that fewer than 250 individuals might remain and that the population was likely declining. Habitat loss and other pressures eventually led to its classification as Critically Endangered in 2021.
Evolutionarily, the species is exceptionally distinctive. Analyses of evolutionary uniqueness have ranked it within the top three percent of all living bird species. Despite this importance, almost nothing was known about its ecology. The only historical field notes came from nineteenth-century collectors, who recorded little more than a brief description of the bird's call and the mountainous terrain where it had been found. Because of this scarcity of information, the primary goal of the recent expedition was to determine whether the species still existed and to gather any possible natural history observations.
Fergusson Island lies within the D'Entrecasteaux Archipelago and is the largest island in the group. Its rugged terrain and dense vegetation have limited biological surveys, and new bird records have continued to emerge in recent decades. Compared with other members of the genus Otidiphaps, the Black-Naped Pheasant-Pigeon lacks the striking neck coloration and crest found in its relatives. Nevertheless, its bright orange wings remain a distinctive feature. The species inhabits mid-elevation forests and behaves much like many ground-dwelling pheasants in Asian forests—quiet, cautious, and difficult to detect. Such traits make conventional short-term surveys extremely challenging.
Recognizing this difficulty, researchers turned to local ecological knowledge. People who regularly hunt in the forests often possess detailed knowledge of wildlife gained through decades of direct experience. The research team therefore conducted interviews with residents living around the Mt. Kilkerran massif on eastern Fergusson Island. In total, 29 questionnaires were completed across ten locations. Most participants were experienced hunters who had spent many years moving through the island's forests.
To assess the reliability of local knowledge, researchers first tested participants' ability to identify birds. Twenty-five illustrated bird cards were shown, including species known to occur on Fergusson, species absent from the island, and species with uncertain distributions. Participants were asked to select the birds they recognized from their surroundings. Overall accuracy reached about 84 percent, with large or distinctive birds rarely misidentified.
A second test used recorded bird calls. Participants listened to recordings of several common species and were asked to identify them by their local names. Identification accuracy averaged roughly 82 percent. These results confirmed that the hunters possessed extensive knowledge of local birdlife, consistent with earlier studies demonstrating the remarkable observational expertise of hunters in Papua New Guinea.
Among the interview participants, eleven individuals recognized the Black-Naped Pheasant-Pigeon in the illustrated lineup. Five could also identify the calls of related species during the audio test, and eight provided detailed descriptions of the bird's appearance, habitat, and behavior. Most strikingly, two hunters reported having personally seen the species within the previous year.
The interviews also revealed valuable cultural knowledge. In the Galea language, the bird is known as “Auwo,” a name believed to imitate its call. Community members shared stories, chants, and ceremonial traditions associated with the species. One chant linked the bird with favorable weather and romantic imagery. Another legend told of a woman mistreated by her family who fled into the mountains and was transformed into the bird; its mournful call was said to represent her longing for home. Such traditions demonstrate that the species holds cultural significance for local communities.
After completing the interviews, researchers installed camera traps in areas recommended by hunters as well as in other suitable habitats. Thirty cameras were deployed and operated for a total of 253 camera days, generating more than three thousand trigger events. These recordings documented seven bird species and five mammals.
The most remarkable discovery occurred in September 2022. A camera positioned along an elevational gradient at 746 meters above sea level recorded a Black-Naped Pheasant-Pigeon. The footage showed the bird walking across the forest floor while rhythmically pumping its tail—providing the first behavioral record of the species ever captured on video. A second camera, placed at 971 meters in a location suggested by a hunter, photographed another individual on two consecutive days. The two records were more than five kilometers apart, indicating that at least two birds survive on the island.
Interestingly, despite conducting seventy separate bird surveys and documenting ninety-three bird species, researchers never observed the Black-Naped Pheasant-Pigeon directly. In contrast, the camera traps detected the species within a short time. This contrast highlights the effectiveness of combining camera traps with local ecological knowledge.
The species' elusive behavior may explain why it remained undetected for so long. Members of the genus Otidiphaps behave much like forest pheasants in Southeast Asia—quiet and secretive, rarely seen unless calling. Their vocal activity may occur only during specific seasons, making short field expeditions easy to mistime. Local residents, however, spend time in the forest throughout the year, accumulating observations that span much broader temporal scales.
Another intriguing finding was that knowledge of the species varied greatly between communities. In some villages only a few kilometers from confirmed camera records, most participants had never heard of the bird. Researchers suggest that this may reflect an “extinction of experience”—a phenomenon in which declining wildlife populations gradually disappear not only from ecosystems but also from human memory.
The study strongly supports the current IUCN classification of the species as Critically Endangered. Camera trap records showed the bird in only about two percent of independent captures, and only a small fraction of interview participants reported seeing it recently. Logging activities, road construction, and introduced predators such as feral cats may pose immediate threats. In addition, historical sea-level changes fragmented the once-continuous landmass of the D'Entrecasteaux shelf into isolated islands. The population on Fergusson may therefore represent a remnant of a once larger distribution that has gradually contracted over time.
Researchers recommend further surveys across other mountainous regions of Fergusson Island, as well as nearby Goodenough and Normanby Islands, which were historically connected to Fergusson during lower sea levels. Molecular studies are also needed to clarify the species' evolutionary relationships within the genus.
Although related pheasant-pigeon species have successfully bred in captivity in zoos, the researchers emphasize that conservation efforts should prioritize protecting the species within its natural habitat. The bird not only occupies a unique ecological niche but also carries cultural meaning for the communities who share its landscape.
The rediscovery of the Black-Naped Pheasant-Pigeon illustrates how collaboration between scientists and local communities can reveal species thought lost to history. By bridging scientific techniques and indigenous knowledge, conservationists may gain powerful tools for locating and protecting the world's most elusive and endangered wildlife.
Author: Shui-Ye You
Reference:
Gregg JJ et al. (2024). Lost to science for 126 years: Indigenous Knowledge and Camera Trapping Document the Critically Endangered Black-Naped Pheasant-Pigeon Otidiphaps insularis. bioRxiv.
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