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A landmark study published in the journal PLOS Biology has developed a DNA-based genomic reference map capable of tracing the geographic origin and trafficking routes of illegally traded pangolins with remarkable precision. The findings have significant implications for wildlife crime enforcement, including in India.

The Scientific Breakthrough

Pangolins account for nearly a third of all recorded international wildlife seizures in recent years, making them the world's most heavily trafficked mammals. Despite this, forensic tracing has long been hampered by the difficulty of extracting usable DNA from degraded pangolin samples confiscated at borders.

The research team overcame this barrier by employing a gene-capture method to recover usable genomic information from degraded samples. The team sequenced DNA from more than 700 samples — drawn from museum collections, field sites, bushmeat markets, and international trade seizures — covering Sunda, Chinese, and white-bellied pangolins. Using genetic data from specimens of known geographic origin, they constructed a genomic reference map capable of tracing each trafficked individual back to its source population.

A key innovation was the development of a single gene-capture kit that works across all eight pangolin species and on degraded museum specimens, making genomic tracing more accessible, scalable, and practical for real-world conservation and forensic use.

Global Poaching Hotspots Identified

The data revealed several hotspots of illegal pangolin collection, including southwestern Cameroon, Myanmar, and multiple locations across Africa. The genetic record also tracks major trade routes across the borders of China and between Indonesian islands.

A particularly significant finding for India: the genomic data exposed an active illicit wildlife network originating from northeastern India — around Arunachal Pradesh and Assam — and potentially Bhutan, directly supplying Yunnan province in China. This makes India's northeastern biodiversity corridor a critical front in the global battle against wildlife trafficking.

Dismantling the Domestic-International Divide

One of the study's most consequential revelations is that domestic pangolin trade is largely local but overlaps with the same sourcing regions that supply international trafficking — revealing a connected supply chain rather than separate markets. This disproves the earlier assumption that local and global pangolin trafficking operate independently.

About Pangolins: Conservation Context

There are eight pangolin species globally — four African (Black-bellied, White-bellied, Giant Ground, Temminck's Ground) and four Asian (Indian, Philippine, Sunda, Chinese). All eight are listed under Appendix I of CITES, prohibiting commercial trade. On the IUCN Red List, the Indian Pangolin (Manis crassicaudata) is Endangered, while the Chinese Pangolin (Manis pentadactyla) — found in India's Northeast — is Critically Endangered. Both species receive the highest domestic legal protection under Schedule I of the Wildlife (Protection) Act, 1972.

Pangolins are ecologically vital — their digging aerates soil and controls ant and termite populations — but biologically vulnerable. Females produce only a single offspring at a time, meaning population recovery after depletion is extremely slow. Their defensive instinct of rolling into a ball, effective against natural predators, makes them trivially easy for poachers to collect by hand.