Eupatorus siamensis
In 3 days ~20% in a week ~40%
Eupatorus siamensis (Thai: ด้วงกว่างซางสยาม) is a species of rhinoceros beetle in Isan, Thailand and Cambodia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Yai National Park | 🇹🇭 Thailand |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Eupatorus siamensis sighting in Khao Yai National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 183rd most-seen of the 221 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
September
In that month about 40% of wildlife watchers report a Eupatorus siamensis in Khao Yai National Park on a given day, against under 5% in October to August, the lowest months. That is one of Khao Yai National Park's wettest months, with about 330 mm of rain against 15 mm in December.
Only Khao Yai National Park, in our data
Khao Yai National Park is the only park on Wallace's Line with enough records to rate Eupatorus siamensis sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Scarabaeidae
The closest relatives of the Eupatorus siamensis that you can see in Khao Yai National Park (family Scarabaeidae, Scarabs) are Atlas Beetle (about 20%), Siamese Rhinoceros Beetle (about 10%) and Sovereign Large Dung Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Eupatorus siamensis is recorded against all the insects logged in Khao Yai 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.
