Chalcosoma moellenkampi
In 3 days ~80% in a week >90%
The Moellenkampi beetle (Chalcosoma moellenkampi), is one of four large species of rhinoceros beetles from Southeast Asia belonging to the genus Chalcosoma. The Moellenkampi beetles belong to the beetle family Scarabaeidae along with other rhinoceros beetles. They are characterized by having two large, forward-projecting horns on the pronotum or thorax, and another large, forward and upward-projecting horn on the head. They also have a distinct metallic lustre, which is the reason behind their genus name, which derives from Greek, chalko-, and is the combining form of chalkós, meaning copper.
Unlike its close relatives, C. atlas and C. chiron, C. moellenkampi has a rather restricted geographic distribution and appears to occur only on Borneo. Chalcosoma moellenkampi can reach about the same size as C. atlas, and males may measure up to 110 mm (4.3 in) from the tip of the head horn to the end of the elytra (wingcases). The largest species in the genus is Chalcosoma chiron, where males may occasionally reach 130 mm (5.1 in). Females are much smaller than males, usually only 45–60 mm (1.8–2.4 in), and lack horns. Unlike the males, which in Chalcosoma... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 2 | Kinabalu Park | 🇲🇾 Malaysia |
Likely
About 40% of wildlife watchers report a Moellenkampi Beetle sighting in Kinabalu Park on a given day, based on 85 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 297 insects we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
May
In that month about 50% of wildlife watchers report a Moellenkampi Beetle in Kinabalu Park on a given day, against about 20% in January and August, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Moellenkampi Beetle sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 2 parks where we can rate Moellenkampi Beetle sightings, Kinabalu Park ranks 2nd at about 40%, level with the leaders once rounded. The best odds are in Danum Valley Conservation Area (Malaysia, about 40%).
GBIF citizen-science records
It is estimated from how often the Moellenkampi Beetle is recorded against all the insects logged in Kinabalu Park (85 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.
