Painted Bat (Kerivoula picta)

The painted bat (Kerivoula picta) is a small vesper bat belonging to the family Vespertilionidae, subfamily Kerivoulinae. First described by Peters in 1867, it is distinguished by its strikingly patterned dorsal fur, which combines shades of orange‑brown, black, and white, giving the species its common name. Its ears are relatively large and rounded, and the tragus is long and pointed, adaptations that aid in maneuvering through cluttered forest understories. K. picta inhabits lowland tropical and subtropical forests across South and Southeast Asia, including India, Bangladesh, Myanmar, Thailand, Laos, Vietnam, Peninsular Malaysia, and the islands of Sumatra and Borneo. The bat roosts in small colonies within hollow trees, bamboo clumps, and limestone caves, often selecting sites with high humidity that support a rich insect fauna. It forages close to the ground and within the canopy, using a combination of aerial hawking and gleaning to capture a variety of arthropods. The International Union for Conservation of Nature (IUCN) currently classifies the painted bat as Least Concern because of its relatively wide distribution and presumed large population, although localized declines have been recorded. Ongoing threats such as deforestation, agricultural expansion, and disturbance of roost sites underscore the need for continued monitoring and habitat protection.

Painted bats are nocturnal and highly agile, navigating the dense understory of tropical forests with rapid, erratic flight. They typically form small, loose colonies of 5–20 individuals, although solitary roosting has been observed in marginal habitats. Home ranges are modest, often limited to a few square kilometers centered around reliable roost sites and abundant insect prey. Social interactions are mediated by a repertoire of high‑frequency echolocation calls (70–90 kHz) used for navigation and prey detection, as well as lower‑frequency social calls that facilitate group cohesion and mother‑pup communication. Territoriality is weak; individuals tolerate conspecifics in overlapping foraging zones but may defend preferred roosting cavities. Seasonal movements are minimal, with bats remaining resident year‑round, adjusting activity patterns in response to rainfall and insect availability.

The painted bat is an insectivore that exploits a broad spectrum of arthropods inhabiting the forest understory. Stomach‑content analyses and fecal DNA studies have identified moths (Lepidoptera), beetles (Coleoptera), flies (Diptera), and true bugs (Hemiptera) as primary prey items, with occasional consumption of spiders (Araneae) and small orthopterans. Foraging is conducted at low heights, often within a few meters of the canopy, where the bat employs both aerial hawking—capturing insects in flight—and gleaning—snatching stationary prey from leaves and bark. Its acute echolocation system, emitting calls at 80–90 kHz, enables detection of minute prey against complex background clutter. Daily food intake is estimated at 5–7 % of body mass, translating to roughly 0.25–0.35 g of insects per night for an adult weighing 5 g. Seasonal fluctuations in insect availability can lead to increased foraging effort during the dry season, and the species may temporarily shift its diet toward more abundant dipteran swarms.

Female painted bats reach sexual maturity at about 10–12 months of age. Breeding generally occurs once a year, timed to the onset of the rainy season when insect abundance peaks, typically between May and August in the Indian subcontinent and between June and September in Southeast Asia. After a gestation period of roughly 70 days, females give birth to a single offspring, although twins have been reported on rare occasions. Neonates are born altricial, weighing about 1 g and covered in fine gray fur. The mother carries the pup attached to her ventral fur while foraging and returns to the roost nightly to nurse. Pups are weaned after 4–5 weeks and become volant at around 6 weeks, after which they gradually integrate into the colony’s foraging activities. Longevity in the wild is modest, with most individuals reproducing only 2–3 times before succumbing to predation or habitat loss.

The IUCN Red List classifies the painted bat (Kerivoula picta) as Least Concern, reflecting its extensive range across South and Southeast Asia and its presumed large, though unquantified, population. Nevertheless, the species faces several anthropogenic pressures that could precipitate localized declines. Primary threats include deforestation for timber extraction, oil palm plantations, and infrastructure development, which reduce the availability of roosting trees and foraging habitat. Cave disturbance from tourism, mining, and guano harvesting can destroy critical roost sites, while the use of pesticides in agricultural landscapes diminishes insect prey and may cause secondary poisoning. Climate change may alter precipitation patterns, affecting insect phenology and the timing of breeding. Population surveys are sparse, but regional assessments suggest a decreasing trend in fragmented habitats. Conservation actions recommended by the IUCN involve protecting forest corridors, safeguarding known roosting caves, and promoting pesticide‑free agricultural practices. Ongoing monitoring and inclusion of the species in national wildlife protection statutes are essential to ensure its long‑term viability.

• The painted bat’s dorsal fur displays a mosaic of orange‑brown, black, and white patches, giving it a ‘painted’ appearance.
• It can maneuver through dense foliage with flight speeds up to 15 m s⁻¹ while emitting high‑frequency echolocation calls.
• Unlike many bats, K. picta often roosts in bamboo clumps as well as tree cavities and caves.
• Its diet includes a high proportion of moths, which it captures both in flight and by gleaning from leaves.
• The species has been recorded at elevations from sea level up to 800 m, showing adaptability to varied forest types.