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| Slender-billed vulture | |
|---|---|
| Name | Slender-billed vulture |
| Status | Critically Endangered |
| Status system | IUCN3.1 |
| Genus | Gyps |
| Species | tenuirostris |
| Authority | (Vieillot, 1816) |
Slender-billed vulture is a large Old World vulture in the genus Gyps. It is native to the Indian subcontinent and parts of Southeast Asia and is closely associated with carrion resources and large ungulate populations. Historically common in India, Bangladesh and Myanmar, it has undergone catastrophic declines in the late 20th and early 21st centuries.
Described by Louis Jean Pierre Vieillot in 1816, the species was long treated within the genus Gyps alongside Rüppell's griffon vulture, White-backed vulture, Himalayan vulture, and Griffon vulture. Molecular phylogenetic studies involving laboratories at institutions such as University of Oxford, Natural History Museum, London, and Smithsonian Institution have clarified relationships among Gyps taxa, linking the slender-billed form with populations studied by researchers from Wildlife Institute of India and BirdLife International. Historical collections in the British Museum and records from explorers like Francis Buchanan-Hamilton provided early material for comparison. Taxonomic treatments by committees such as the International Ornithologists' Union and the American Ornithological Society reflect ongoing evaluation of subspecies limits and nomenclature.
A large vulture with a long, narrow bill, the species shows the characteristic bare head and neck seen in Gyps vultures, resembling descriptions in field guides from authors affiliated with Royal Society for the Protection of Birds, Cornell Lab of Ornithology, and National Audubon Society. Adults possess pale brown upperparts and paler underparts, with broad wings and a short tail similar to those illustrated in plates from the Linnean Society of London collections. Measurements recorded in studies at Bombay Natural History Society and Zoological Survey of India report wing chord, tarsus, and bill dimensions used to distinguish it from Indian vulture and Egyptian vulture in regional surveys.
Historically distributed across peninsular regions of India, much of Bangladesh, parts of Nepal and western Myanmar, the species frequented open plains, dry riverbeds and wooded savannas described in accounts by naturalists linked to Calcutta Botanical Garden and Darjeeling Natural History Museum. Its range contracted sharply in the 1990s and 2000s with remaining pockets noted near protected areas such as Keoladeo National Park, Sundarbans, and sanctuaries managed by agencies including the Ministry of Environment, Forest and Climate Change (India). Satellite telemetry projects run in collaboration with institutions like International Centre for Birds of Prey and regional universities have tracked movements between feeding sites, nesting cliffs and communal roosts.
Social and gregarious, the species formed large communal roosts and foraging flocks observed in long-term studies by researchers from Wildlife Trust of India and Royal Society for the Protection of Birds. Flight behaviour—thermal soaring, wing-locking and communal detection of carcasses—parallels descriptions in comparative work by Jane Goodall Institute-affiliated ecologists and avian ecologists at University of Cambridge. Interactions with scavengers such as Bengal fox, Golden jackal, and other Gyps species were documented in field notes archived at the Wildlife Institute of India. Disease ecology investigations by teams from World Wildlife Fund and Centre for Cellular and Molecular Biology examined pathogen exposure and impacts of veterinary pharmaceuticals.
Primarily a scavenger, it fed on carcasses of large ungulates including domesticated Bos indicus cattle and wild species recorded in surveys conducted by International Union for Conservation of Nature partners and researchers from Indian Council of Agricultural Research. Foraging often occurred at carcass dumps, abattoirs and along migration corridors identified in collaborative studies with Food and Agriculture Organization and local livestock departments. Competition and facilitation with other scavengers such as Marabou stork and mammalian carnivores were noted in ecological studies by the Zoological Society of London and regional conservation NGOs.
Nesting typically took place on tall trees and cliffs, with clutch size, incubation periods and fledging intervals reported in monitoring programs run by Bombay Natural History Society and university partners including Banaras Hindu University. Breeding colonies were historically recorded in reports to governmental bodies such as the Ministry of Environment, Forest and Climate Change (India) and in ornithological surveys by researchers at Wildlife Institute of India. Juvenile dispersal patterns were characterized using ringing and telemetry studies overseen by organizations like BirdLife International and regional bird-ringing schemes supported by international collaborators.
The species is listed as Critically Endangered by the International Union for Conservation of Nature following dramatic declines primarily attributed to exposure to the veterinary NSAID diclofenac, identified in pharmacovigilance research involving teams from Royal Society for the Protection of Birds, United States Geological Survey, and Wildlife Conservation Society. Conservation responses have included bans on veterinary diclofenac implemented by governments such as India and Pakistan, captive-breeding programs coordinated by Zoological Society of London and National Centre for Biological Sciences, and regional action plans developed with input from BirdLife International, World Wide Fund for Nature, and national wildlife agencies. Ongoing threats include poisoning, habitat loss from development projects involving agencies like National Highways Authority of India, and reduced availability of safe carcasses, prompting interventions by NGOs including Conservation International and partnerships with veterinary authorities to promote alternatives such as meloxicam. International collaboration among institutions including Smithsonian Institution, Royal Society, and regional universities remains central to recovery efforts.
Category:Gyps