Hipposideros diadema
Silhouette: T. Michael Keesey · PhyloPic
In 3 days ~30% in a week ~60%
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 |
No species of the same family or order lives in Khao Sok National Park, so these are its closest relatives here: other mammals.
With luck
About 10% of wildlife watchers report a Diadem Roundleaf Bat sighting in Khao Sok National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 13th most-seen of the 14 mammals we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
September
In that month about 50% of wildlife watchers report a Diadem Roundleaf Bat in Khao Sok National Park on a given day, against under 5% in March–June, August, October and December–January, the lowest months. That is one of Khao Sok National Park's wettest months, with about 280 mm of rain against 35 mm in February.
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.
3rd of 4
Of the 4 parks where we can rate Diadem Roundleaf Bat sightings, Khao Sok National Park ranks 3rd at about 10%. The best odds are in Gunung Leuser National Park (Indonesia, about 30%) and Danum Valley Conservation Area (Malaysia, about 20%).
GBIF citizen-science records
It is estimated from how often the Diadem Roundleaf Bat is recorded against all the mammals logged in Khao Sok National Park (5 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.
