Thai National Parks

Species of Thailand

Hardwicke's woolly bat

Kerivoula hardwickii, Thomas Horsfield, 1824

Hardwicke's woolly bat (Kerivoula hardwickii) is a species of vesper bat in the Vespertilionidae family. It is found in China, India, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Sri Lanka, Thailand and Vietnam. The bat typically inhabits the forest understory of these regions and roosts in hollow trees or dead clusters of leaves. As typical with understory bats, this species is slow flying and highly maneuverable.

Known as රත් බොර කිරිවවුලා (meaning "reddish brown kerivoula") in Sinhala.


The fur on the dorsal, or backside, of the bat is typically a smoky brown color while the ventral portion is a lighter greyish brown color. A forearm length for this bat is typically 31-36 millimeters and the ears are approximately 11-15 millimeters. This species also has a more prominent size difference in the size of its premolars than other Kerivoula species, such as Painted bat Wing membrane is blackish brown but translucent. The fur is very soft and of moderate length.

Association with pitcher plants

This small bat has been found roosting above the digestive fluid in the pitchers of the carnivorous plant Nepenthes hemsleyana (previously known as Nepenthes baramensis and informally as Nepenthes rafflesiana var. elongata), which grows in the peat swamps and heath forests of Borneo. This relationship appears to be mutualistic, with the plant providing shelter for the bats and in return receiving additional nitrogen input in the form of faeces. It has been estimated that the plant derives 33.8% of its total foliar nitrogen from the animals' droppings.

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Scientific classification

Kerivoula hardwickii

Common names

  • English:
    • Common woolly bat
    • Hardwicke's forest bat
    • Hardwicke's woolly bat
    • Hardwicke’s woolly bat


  • Kerivoula malpasi, Phillips (1932)
  • Kerivoula hardwickii, Phillips (1932)
  • Kerivoula hardwickii, Robert Charles Wroughton & Kathleen V. Ryley (1913)
  • Kerivoula crypta, Robert Charles Wroughton & Kathleen V. Ryley (1913)
  • Kerivoula hardwickii, Gerrit Smith Miller, Jr (1906)
  • Kerivoula depressa, Gerrit Smith Miller, Jr (1906)
  • Kerivoula fusca, George Edward Dobson (1871)
  • Vespertilio hardwickii, Thomas Horsfield (1824)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


No photo for this species yet

Range Map

Distribution map of Hardwicke's woolly bat, Kerivoula hardwickii in Thailand
  • Khao Sok National Park
Range map of Kerivoula hardwickii in Thailand