Megasoma actaeon
In 3 days ~60% in a week ~90%
The Actaeon beetle (Megasoma actaeon) is a rhinoceros beetle of the family Scarabaeidae. The species name actaeon derives from the name Actaeon of a famous Theban hero, son of the priestly herdsman Aristaeus and Autonoë in Boeotia, trained by the centaur Chiron.
Actaeon beetle is one of the largest of all beetles, measuring up to 7 centimetres (2.8 in) across, with a body length of about 5–12 centimetres (2.0–4.7 in). The males can grow to be 13+1⁄2 cm (5.3 in) long by 4 cm (1.6 in) thick.
The dorsal surfaces are glabrous (bald), matte or shiny black. The legs are powerful, with large tarsal claws. Males have appendages resembling horns on the pronotum and on the head. The two parallel horns on the pronotum are short, acute and forward pointing, while a much longer horn with a small tooth is present on the head. In the females the pronotum and the elytra are rugose and the horns are missing.
Females lay eggs into soil at eclosion and eggs develop in about 9 months. Larval development and pupation takes in total almost 3 years. Larvae at the 3rd instar can reach the weight of 200 grams, the highest weight among insects. Life expectancy... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Brownsberg Nature Park | 🇸🇷 Suriname |
More parks will be added in future updates.
Possible
About 30% of wildlife watchers report an Actaeon Beetle sighting in Brownsberg Nature Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 51st most-seen of the 74 insects we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
April and November
In those months about 50% of wildlife watchers report an Actaeon Beetle in Brownsberg Nature Park on a given day, against under 5% in December to March, the lowest months. September has too few records to rate.
Between 4 and 7 am
Across all the parks we cover, that three-hour window holds the most Actaeon Beetle sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Only Brownsberg Nature Park, in our data
Brownsberg Nature Park is the only park on Wallace's Line with enough records to rate Actaeon Beetle sightings: about 30% of wildlife watchers there report one on a given day.
Same family: Scarabaeidae
The closest relatives of the Actaeon Beetle that you can see in Brownsberg Nature Park (family Scarabaeidae, Scarabs) are Cyclocephala amazona (about 30%) and Cyclocephala melanocephala (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Actaeon Beetle is recorded against all the insects logged in Brownsberg Nature 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.
