Hipposideros diadema
Silhouette: T. Michael Keesey · PhyloPic
In 3 days ~60% in a week ~90%
The diadem leaf-nosed bat or diadem roundleaf bat (Hipposideros diadema) is one of the most widespread species of bat in the family Hipposideridae. It is probably most closely related to Hipposideros demissus from Makira and to Hipposideros inornatus from the Northern Territory in Australia. Hipposideros diadema is found in Australia, Indonesia, Malaysia, Myanmar, the Philippines, Thailand, and Vietnam.
Hipposideros diadema is named for its complex anterior nose leaf, which is horseshoe-shaped and located on the slightly inflated nasal region. This nose shaped evolved to assist in echolocation, adding the noseleaf and the associated intricate musculature to help the nose resonate more effectively. The transverse leaf is erect and there is no median projection. They have huge ears mainly because of the well developed antitragus, while no tragus is present. Males have a sac located posterior to the nose which can secrete a waxy substance, thought to be used in attracting mates and status determination. Body length ranges from six to ten centimeters when adult, with brown fur covering all but the limbs. The underbelly is paler in color, and white spots can be found in... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gunung Leuser National Park | 🇮🇩 Indonesia | |
| 2 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 3 | Khao Sok National Park | 🇹🇭 Thailand | |
| 4 | Daintree National Park | 🇦🇺 Australia |
Possible
About 30% of wildlife watchers report a Diadem Roundleaf Bat sighting in Gunung Leuser National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 8th most-seen of the 19 mammals we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
February and April
In those months about 40% of wildlife watchers report a Diadem Roundleaf Bat in Gunung Leuser National Park on a given day, against under 5% in May, August and December–January, the lowest months. Those are among Gunung Leuser National Park's driest months, with about 280 mm of rain a month against 700 mm in September.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Diadem Roundleaf Bat sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 4 parks where we can rate Diadem Roundleaf Bat sightings, Gunung Leuser National Park has the highest daily chance: about 30%. Next come Danum Valley Conservation Area (Malaysia, about 20%) and Khao Sok National Park (Thailand, about 10%).
GBIF citizen-science records
It is estimated from how often the Diadem Roundleaf Bat is recorded against all the mammals logged in Gunung Leuser National Park (16 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
