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Oct 10 2026
Why are vultures not back even after the conservation efforts worked?
Overview
The Swarajya article “India’s Vulture Conservation Saved the Species. So Why Aren’t the Birds Back?” examines the catastrophic decline of India’s vultures and the continuing difficulty of restoring their populations. Between the early 1990s and early 2000s, approximately 99% of the country’s white-rumped vultures disappeared in one of the fastest recorded collapses of a bird species.
Researchers eventually identified veterinary diclofenac—a painkiller widely administered to cattle—as the principal cause. India’s conservation measures helped stop the rapid decline, but rebuilding vulture populations remains a long and difficult process after such an extreme collapse.
Details
Article: India’s Vulture Conservation Saved the Species. So Why Aren’t the Birds Back?
Publication: Swarajya
Author: Adithi Gurkar
Reading time: Approximately 17 minutes
Primary subject: The decline, conservation and slow recovery of India’s vulture populations.
Population collapse: Approximately 99% of India’s white-rumped vultures disappeared between the early 1990s and early 2000s.
Scale of decline: The article describes the event as the fastest recorded collapse of any bird species, exceeding the decline rates associated with the passenger pigeon and dodo.
Affected species: India’s three Gyps vulture species experienced severe population losses from their 1992 levels.
Natural sanitation role: Vultures previously disposed of livestock carcasses rapidly and without requiring municipal services, vehicles or public expenditure.
Livestock mortality: Approximately 30 million livestock die in India annually, creating a substantial need for safe carcass disposal.
Ecological vacuum: After vultures disappeared, animal carcasses remained exposed for days instead of being consumed within hours.
Feral-dog population: Feral dogs expanded into the ecological space left by vultures, increasing potential human exposure to rabies.
Water contamination: Decomposing carcasses near dumping grounds contributed to the deterioration of surrounding water sources.
Human mortality: Research by economists Eyal Frank and Anant Sudarshan found that mortality increased by approximately 4.7% in districts that had lost their vultures.
Estimated deaths: The decline was associated with roughly 104,000 additional deaths annually and more than half a million deaths over five years.
Health consequences: The estimated deaths were connected with rabies, contaminated water and diseases associated with unmanaged organic waste.
Economic cost: Researchers estimated the annual economic cost of the vulture collapse at approximately $69 billion.
Early warning: Researchers monitoring nests at Keoladeo in Bharatpur were among the first to recognise the scale of the decline.
Keoladeo colony: A colony containing approximately 350 white-rumped vulture nests during the mid-1980s had no remaining nests by 1999.
Initial suspicion: Disease was initially considered the most likely cause because of the speed and geographical extent of the deaths.
Post-mortem evidence: Examinations revealed a white crystalline coating across the birds’ internal organs, but its cause remained unknown for several years.
Cause identified: Research published in Nature in 2004 identified veterinary diclofenac as the principal cause of the deaths.
Veterinary use: Diclofenac was commonly administered to cattle for fever, inflammation, swelling and physical injuries.
Contaminated carcasses: A livestock animal treated with diclofenac shortly before death could poison every vulture feeding on its carcass.
Effect on vultures: Vultures cannot effectively metabolise diclofenac. The drug causes uric-acid crystals to accumulate across their organs, leading to kidney failure and death.
Drug persistence: Unlike the safer painkiller meloxicam, which clears relatively quickly, diclofenac can remain in an animal’s system for approximately 12 hours.
Fatal exposure: A single contaminated cattle carcass could potentially kill approximately 30 vultures feeding together.
Conservation achievement: Regulatory and conservation measures helped reduce diclofenac-related deaths and prevented the species from continuing towards immediate extinction.
Recovery challenge: Preventing further deaths is different from rebuilding a population that has already fallen by 99%. Recovery requires sustained protection, safe food sources and successful reproduction over many years.
Key takeaway: Vultures are essential providers of ecological sanitation and public-health protection. Their disappearance illustrates how the loss of one species can create extensive environmental, social and economic consequences.
Further information: The complete discussion of conservation measures and the barriers preventing population recovery is available in the original Swarajya article.
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