Calosoma scrutator
In 3 days ~20% in a week ~40%
Calosoma scrutator, commonly known as the fiery searcher and caterpillar hunter, is a species of ground beetle belonging to the genus Calosoma. This beetle can be as large as 35 millimetres (1.4 in) long, and is hence among the largest of the ground beetles found in North America. The distribution of this species is relatively widespread, and is common in North America. The adult beetle is known to excrete a foul-smelling oil when it is handled. The oil has been described as smelling similar to rotten milk or rancid olive oil.
It was originally described in Virginia by Johan Christian Fabricius in 1775. It is a predatory beetle and also happens to be predatorial in its larval stage as well. Their varying colors and metallic shine make them very intriguing to those who spend time collecting different types of bugs. They are found mostly in North America along the east coast but have been found in Mexico, Venezuela, and Guatemala. Adults eat caterpillars and other worms, but most notably the forest tent caterpillar (Mala-cosoma disstria) and cankerworms. This fact gives Calosoma scrutator the nickname of "Caterpillar Hunter". These beetles are very good predators of agricultural pests such as spongy moth larvae. Predators that like to snack on the fiery searcher beetle include skunks, birds, raccoons, foxes, and toads. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zion National Park | 🇺🇸 United States | |
| 2 | Grand Canyon National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States | |
| 4 | Saguaro National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Dallas | 🇺🇸 United States | |
| 3 | San Antonio | 🇺🇸 United States | |
| 4 | Houston | 🇺🇸 United States | |
| 5 | Baltimore | 🇺🇸 United States | |
| 6 | Washington | 🇺🇸 United States | |
| 7 | New York City | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Fiery Searcher sighting in Zion National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 75th most-seen of the 114 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.
March to May
In those months about 10% of wildlife watchers report a Fiery Searcher in Zion National Park on a given day, against under 5% in June to February, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Fiery Searcher sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 4 parks where we can rate Fiery Searcher sightings, Zion National Park has the highest daily chance: about 10%. Next come Grand Canyon National Park (United States, about 10%) and Shenandoah National Park (United States, under 5%).
Same family: Carabidae
The closest relatives of the Fiery Searcher that you can see in Zion National Park (family Carabidae, Ground Beetles) are Oblique-Lined Tiger Beetle (about 30%) and Western Tiger Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Fiery Searcher is recorded against all the insects logged in Zion National Park (6 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.
