A common bat in Hong Kong, the Japanese house bat or Japanese pipistrelle is a species of vesper bat.
An adult has a body length of 3.6–4.8 cm (1.4–1.9 in). It prefers to roost inside the the roof of old buildings or in holes in urban structures like bridges. It is found across East Asia, from China and Taiwan to the Korean Peninsula and Japan.
As it is relatively small and difficult to spot, it was recorded using a bat detector in the gardens and near the swimming pool area.
One Pipistrelle can eat up to 4,000 mosquito-sized insects in one evening.