Hipposideros diadema
Silhouette: T. Michael Keesey · PhyloPic
In 3 days ~30% in a week ~50%
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 |
With luck
About 10% of wildlife watchers report a Diadem Roundleaf Bat sighting in Daintree National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 15th most-seen of the 19 mammals we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
February and September–October
In those months about 20% of wildlife watchers report a Diadem Roundleaf Bat in Daintree National Park on a given day, against under 5% in March–August and November–January, the lowest months.
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.
4th of 4
Of the 4 parks where we can rate Diadem Roundleaf Bat sightings, Daintree National Park ranks 4th at about 10%. The best odds are in Gunung Leuser National Park (Indonesia, about 30%), Danum Valley Conservation Area (Malaysia, about 20%) and Khao Sok National Park (Thailand, about 10%).
Same order: Chiroptera
The closest relatives of the Diadem Roundleaf Bat that you can see in Daintree National Park (order Chiroptera, Bats) are Spectacled Flying Fox (about 50%), Queensland Tube-nosed Fruit Bat (about 20%) and Smaller Horseshoe Bat (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Diadem Roundleaf Bat is recorded against all the mammals logged in Daintree National Park (8 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.
