The least woolly bat (Kerivoula minuta) is a species of vesper bat in the family Vespertilionidae. It is found in Indonesia, Malaysia, and possibly Thailand. Its size is 2âÂÂ3 cm (1 in), plus 2âÂÂ5 cm (1âÂÂ2 in) tail and 3âÂÂ4 cm (1âÂÂ2 in) forearm length.