Sri Lankan sloth bear

The Sri Lankan sloth bear (Melursus ursinus inornatus) is a subspecies of the Asian sloth bear, belonging to the family Ursidae. Endemic to the dry‑zone forests, scrublands and grasslands of Sri Lanka, it occupies a fragmented range limited to the island’s northern and eastern lowlands. Characterised by a shaggy, dark brown coat, a distinctive white or cream V‑shaped chest mark, and a long, mobile snout, the bear is well adapted for digging termite mounds. Its forepaws bear long, curved claws that facilitate excavation, while its reduced canine teeth and elongated palate help filter insects. The Sri Lankan subspecies is listed as Vulnerable on the IUCN Red List, with an estimated population of 1,000–1,500 mature individuals, declining due to habitat loss and poaching. Conservation actions include protected‑area management, community‑based anti‑poaching patrols, and habitat restoration programmes aimed at maintaining the dry‑forest mosaic essential for its survival.

Sri Lankan sloth bears are primarily solitary, with females accompanied only by dependent cubs. Males maintain overlapping home ranges that can exceed 30 km², while females occupy smaller territories of 10–15 km² centered on abundant termite mounds. Activity peaks at dusk and during the night, making them largely nocturnal, though they may forage in daylight during the hot dry season. Communication relies on vocalisations such as low growls, hisses, and a characteristic “huff” when disturbed, as well as scent marking with secretions from the anal glands. Seasonal movements are modest; bears travel up to several kilometres to locate food resources, but generally remain within familiar foraging corridors that provide both insects and fruiting trees.

The Sri Lankan sloth bear is an omnivorous insectivore, with termites and ants comprising up to 70 % of its diet during the dry season. Bears locate termite mounds by scent and use their powerful foreclaws to break open the soil, then employ a specialized palate to filter insects from the debris. In the wet season, fruiting trees such as Ficus spp., Syzygium spp., and the endemic Ceylon ironwood provide a supplemental source of carbohydrates, accounting for 20–30 % of intake. Occasionally, they consume honey, small vertebrates, and carrion. Daily food consumption averages 5–7 kg, with water obtained from both direct drinking and moisture in prey. Feeding is opportunistic; bears travel long distances (up to 5 km) between termite patches but may remain in a high‑yield area for several days when resources are abundant.

Females reach sexual maturity at 3–4 years, while males mature slightly later at 4–5 years. The breeding season in Sri Lanka is loosely tied to the pre‑monsoon period (February–April), when termite activity rises. After a gestation of 6–7 months, females give birth to a single cub in a self‑made den, often a hollow tree or termite mound, between August and October. Cubs are born blind and weigh about 600–800 g. The mother nurses them for 6–8 months, during which time the cubs learn to dig and forage. Weaning occurs at around 9 months, and the young remain with the mother for up to 2 years before dispersing. Reproductive rates are low, with females typically reproducing every 2–3 years, contributing to the species’ vulnerability to population declines.

The Sri Lankan sloth bear is classified as Vulnerable by the IUCN, with an estimated 1,000–1,500 mature individuals remaining. Habitat loss is the principal threat: conversion of dry‑zone forest to agriculture, plantation forestry, and urban expansion has reduced suitable habitat by over 30 % in the past three decades. Human‑bear conflict escalates when bears raid crops such as maize and cassava, leading to retaliatory killings. Illegal hunting for body parts, particularly claws used in traditional medicine, adds further pressure. Climate change may exacerbate termite scarcity during prolonged droughts, reducing food availability. Conservation initiatives focus on expanding protected‑area networks, implementing community‑based conflict mitigation (e.g., electric fencing, crop‑guarding dogs), and strengthening law enforcement to curb poaching. Population monitoring using camera traps and genetic sampling aims to refine abundance estimates and guide management actions.

• Sri Lankan sloth bears have a specialized palate that acts like a sieve, allowing them to filter insects from soil and leaf litter.
• They are one of the few bear species that can stand on their hind legs for extended periods while foraging.
• Unlike most bears, sloth bears lack a pronounced hibernation period and remain active year‑round.
• Their white chest V‑mark is unique to each individual, aiding researchers in field identification.
• The subspecies was first described by Edward Blyth in 1851, making it one of the earliest recognized bear subspecies in South Asia.