Hog in the limelight

Why in the News

The Assam government has praised a captive breeding programme for lifting the State’s pygmy hog population over the last three decades. The species was believed extinct by the mid twentieth century, and a few individuals rediscovered in 1971 prompted the conservation effort that the Pygmy Hog Conservation Programme formalised in 1995. The recovery in captivity has outpaced the recovery of the habitat. Numbers held in breeding centres can be raised on a schedule, while the alluvial floodplain grasslands the species needs in the wild continue to fragment, which is what decides whether released animals survive.

What is the pygmy hog?

1. Sole surviving species of its genus: The pygmy hog is the only living species of the genus Porcula and the world’s smallest wild suid (a member of the pig family).
2. Grassland dependence: It relies on dense grassland to feed, to conceal itself and to reproduce, so it cannot persist where tall cover is removed.
3. Range: Its surviving distribution is confined to the alluvial floodplain grasslands of Assam.

Why does the pygmy hog work as an indicator species?

1. Distress signals habitat degradation: Decline in an animal that lives inside dense grassland is read directly as degradation of the floodplain that produces that grassland.
2. Protection carries other species with it: Securing the grassland the pygmy hog needs also extends protection to the Bengal florican, the hispid hare, the hog deer and the greater one horned rhinoceros.
3. The unit of conservation is the ecosystem: Survival in the wild depends on the survival of a specific ecosystem rather than on the numbers held in any one facility.

How was the species brought back from presumed extinction?

1. The original cause of decline: Floodplains were converted for farms, tea plantations and flood control infrastructure, then degraded by invasive plants and altered flood cycles, with unscientific burning of grasslands fragmenting what remained.
2. Rediscovery and programme: A few individuals found in 1971 prompted an early conservation effort, and the current work descends from the Pygmy Hog Conservation Programme begun in 1995.
3. The measured gain: Captive breeding raised the pygmy hog population in Assam 32-fold over the last three decades.
4. What breeding from a small stock demands: Conservationists must track pedigree, follow biosafety protocols because suids are highly susceptible to swine diseases, and condition individuals before release.

Why is the recovery still not secure?

1. Numbers remain small: The Durrell Wildlife Conservation Trust records some 250 individuals in early 2025.
2. Counting is unreliable: The animals are difficult to spot and count, so how many exist in the wild cannot be stated with confidence.
3. One natural population is left: The last surviving natural population sits in the Panbari grasslands area of Manas National Park.
4. Insurance is not a guarantee: Captive individuals form the insurance group against loss in the wild, and the long term evolutionary fitness of that group is not assured.

Challenges to pygmy hog recovery

1. Genetic bottleneck: Breeding from a small founder stock accumulates harmful gene variants and holds genetic diversity low. Eg. Researchers working on the programme flag both as limits on the captive group’s long term fitness.
   The Fix: Manage the captive population as a single studbook with planned pairings and periodic exchange between breeding centres.
2. Disease susceptibility: Pigs carry high susceptibility to swine diseases, so one outbreak can erase decades of breeding in a single season. Eg. African swine fever outbreaks in Assam from 2020 killed domestic pigs across multiple districts.
   The Fix: Hold breeding stock at physically separated centres under enforced biosafety protocols rather than at one site.
3. Fire used as grassland management: Widespread dry season burning carried out to ‘save’ grasslands destroys the dense cover the species feeds and breeds in. Eg. Fires set across whole grassland blocks remove the tall cover in a single sweep.
   The Fix: Move to mosaic burning on a rotation that leaves unburnt refuge patches in every season.
4. Woody encroachment: Suppressing ecological processes altogether allows trees and shrubs to convert grassland into woodland. Eg. Embankments and flood control works on the Brahmaputra floodplain have cut the natural flooding that renews grassland.
   The Fix: Restore periodic flooding and controlled disturbance so grassland succession is held in check.
5. Habitat fragmentation: Protected grasslands survive as disconnected blocks, so released animals cannot disperse or recolonise adjoining areas. Eg. Fragmentation of protected grassland in Rupahi and Kanchanbari separates the sites Assam is relying on for release.
   The Fix: Reconnect the fragments and restore buffer zones around Manas and Orang National Parks and the Sonai Rupai Wildlife Sanctuary.
6. Invasive plants: Introduced species change grassland structure and displace the native grasses the species depends on. Eg. Invasive growth has spread through degraded floodplain grassland alongside altered flood cycles.
   The Fix: Fund sustained mechanical removal at release sites as a recurring operation rather than a one time clearance drive.

Conclusion

Assam plans to raise the wild pygmy hog population to 300 by 2040. That target is a grassland target rather than a breeding target. Captive numbers can be scaled inside a facility, and the constraint sits outside it, in whether protected grassland is reconnected and buffer zones around the northern Assam parks are restored fast enough to receive the animals. Watch whether grassland restoration is funded as a standing operation, because the breeding side of the programme has already shown what it can deliver on its own.

Back2Basics

1. Manas National Park: Located in Assam along the foothills of the Bhutan Himalaya, on the Manas river, a tributary of the Brahmaputra.
2. Designations: It is a UNESCO World Heritage Site, a tiger reserve, an elephant reserve and a biosphere reserve.
3. Contiguity: It adjoins the Royal Manas National Park in Bhutan, forming a transboundary conservation landscape.
4. Species: It holds the last natural pygmy hog population and is also known for the Bengal florican, the hispid hare and the golden langur.

Matching Previous Year Question

“Consider the following : 1.Star tortoise 2.Monitor lizard 3.Pygmy hog 4.Spider monkey Which of the above are naturally found in India?”