Xyloryctes thestalus
In 3 days ~10% in a week ~20%
Xyloryctes thestalus is a species of rhinoceros beetle in the family Scarabaeidae. These two subspecies belong to the species Xyloryctes thestalus: Xyloryctes thestalus borealis Endrödi, 1975 Xyloryctes thestalus thestalus Bates, 1888 Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zion National Park | 🇺🇸 United States | |
| 2 | Saguaro National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Puebla | 🇲🇽 México | |
| 2 | Mexico City | 🇲🇽 México |
Rare
Under 5% of wildlife watchers report a Western Rhinoceros Beetle sighting in Saguaro National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 248th most-seen of the 354 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
September
In that month about 10% of wildlife watchers report a Western Rhinoceros Beetle in Saguaro National Park on a given day, against under 5% in October to August, the lowest months. That is one of Saguaro National Park's wettest months, with about 50 mm of rain against almost none in May.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Western Rhinoceros Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Western Rhinoceros Beetle sightings, Saguaro National Park ranks 2nd at under 5%. The best odds are in Zion National Park (United States, about 40%).
Same family: Scarabaeidae
The closest relatives of the Western Rhinoceros Beetle that you can see in Saguaro National Park (family Scarabaeidae, Scarabs) are Figeater Beetle (about 10%) and Lesser Triceratops Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Rhinoceros Beetle is recorded against all the insects logged in Saguaro National Park (7 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.
