Guangxi, China – Surveys in the province’s karst landscapes have turned up 98 northern pygmy slow lorises, a figure that points to a far larger presence in the country than earlier estimates allowed. The nocturnal primates, long considered scarce outside Vietnam and Laos, appear to occupy more territory in southern China than biologists had realized. The findings come from fieldwork led by researchers at Guangxi Normal University and appear in the journal Integrative Zoology.
Unexpected Numbers in Familiar Terrain
Field teams recorded the animals across multiple sites in Guangxi, where steep limestone hills and dense forest cover provide the kind of secluded habitat the species favors. Until now, China’s known population stood at just over 100 individuals, concentrated mainly in Yunnan province. The new count in Guangxi alone nearly matches that total and suggests the species may have persisted undetected in these remote areas for years. The lorises’ small size and strictly nocturnal habits make them difficult to spot without targeted night surveys. Earlier assessments relied on limited sightings and habitat models that did not fully account for Guangxi’s rugged interior. The fresh data expand the documented range and indicate that conservation planning will need to include these additional forests.
A Distinct Species With Unusual Traits
The northern pygmy slow loris, formally separated from its southern relative only in 2023, carries a potent bite that delivers venom through specialized glands. Adults weigh roughly 300 grams, sport large forward-facing eyes, and move slowly through the canopy in search of insects, fruit, and tree sap. Their range stretches from northern Vietnam northward into China’s southern provinces, with the Hai Van Pass marking a southern limit in Vietnam. Because the animals remain active only after dark and spend daylight hours hidden in tree hollows or dense foliage, many local communities have never encountered them. The species is listed as endangered, and habitat loss from agriculture and infrastructure projects continues to threaten remaining populations across Southeast Asia.
Next Steps for Protection and Study
Anna Nekaris of Anglia Ruskin University noted the value of such finds for a group of primates that receives little field attention. “A lot of these nocturnal animals – they’re so little known in the wild, they’re so little researched, that when you actually do go look for them and you find them, that’s incredible,” she said. The Guangxi results are expected to prompt additional surveys and refined habitat maps. Wildlife authorities in the region now face the task of confirming whether the newly documented groups require new protected zones or adjustments to existing reserves. Continued monitoring will help determine whether the population is stable or still declining, information that remains limited for most slow loris populations. The discovery underscores how much remains unknown about even well-studied regions when researchers focus on species that operate out of sight. Further work in Guangxi’s karst forests could clarify whether similar overlooked groups exist elsewhere along the species’ northern edge.
