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 Danum Valley Conservation Area on a given day, based on 40 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 102 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.
February
In that month about 60% of wildlife watchers report a Moellenkampi Beetle in Danum Valley Conservation Area on a given day, against under 5% in January, the lowest month. That is one of Danum Valley Conservation Area's driest months, with about 140 mm of rain against 290 mm in May.
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.
Yes
Of the 2 parks where we can rate Moellenkampi Beetle sightings, Danum Valley Conservation Area has the highest daily chance: about 40%. Next come Kinabalu Park (Malaysia, about 40%).
GBIF citizen-science records
It is estimated from how often the Moellenkampi Beetle is recorded against all the insects logged in Danum Valley Conservation Area (40 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.
