Great Roundleaf Bat (Hipposideros armiger) lives in tropical rainforest across Southeast Asia. It feeds on insects and fruit. Its conservation status is Least Concern.
Fascinating facts about the Great Roundleaf Bat
- The great roundleaf bat can be distinguished from its close cousin by the number of lateral accessory leaflets on its noseleaf. It bears four leaflets on each side of the main noseleaf, whereas the related intermediate roundleaf bat has only three. This morphological trait is visible when the bat is examined up close and provides a reliable field character.
- During a study, researchers painted the bat's accessory leaflets and ears to visualise their movement while the animal clicked. When a click was produced, the painted leaflets snapped shut and the ears bent downward, creating a brief closed configuration. The next click caused the noseleaf to open and the ears to flare back up, restoring the normal posture. This rapid motion was captured on video, confirming the dynamic role of the leaflets in sound production.
- The great roundleaf bat serves as a host for the unusual jawed land leech Sinospelaeobdella. This parasite attaches to the bat and feeds on its blood, making the bat a known food source for the leech. Observations of this relationship have been recorded in the species' range, highlighting a specific parasitic interaction. The presence of Sinospelaeobdella underscores the bat's role in supporting specialised ectoparasites.
- The great roundleaf bat hunts by emitting ultrasonic calls that sweep between 65 kHz and 75 kHz, a range that allows it to detect tiny insects in cluttered air. Because it is a low-flying species, these high-frequency pulses work best close to the ground where it pursues prey. It forages in cleared woodland, gardens, between avenues of trees and even around street lights, exploiting the insects attracted to artificial illumination.
- Each year a female great roundleaf bat produces a single litter of two pups, timing the birth to the warm months when insects are abundant. The species breeds once a year, with females found pregnant from January through early May, and the newborns cling to their mothers from February until June. This reproductive schedule ensures the young grow while food is plentiful, supporting their rapid development before they become independent foragers.
Sources
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At a glance
RangeSoutheast Asia
HabitatTropical rainforest
DietInsects and fruit
About the Great Roundleaf Bat
In the velvety darkness of Southeast Asia's tropical caves, the Great Roundleaf Bat unfurls its leathery wings, a master of aerial stealth, as it embarks on nightly forays in search of insect prey. With echolocation calls that pierce the darkness like a series of high-pitched whispers, this bat navigates the labyrinthine passages with ease, its remarkable agility allowing it to make sharp, darting turns in pursuit of its quarry. As it flits through the shadows, its rounded ears and delicate, almost translucent wings beat in a hypnotic rhythm, a testament to the intricate beauty of this nocturnal hunter.
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