Stiretrus anchorago
In 3 days ~10% in a week ~30%
Stiretrus anchorago, commonly known as the anchor stink bug, is a species of predatory stink bug in the family Pentatomidae. It is found in Central America and North America. It is known to prey upon Epilachna varivestis and Hypera postica. Markings on this species are highly variable.
Stiretrus anchorago violaceus (Say, 1828) i c g Data sources: i = ITIS, c = Catalogue of Life, g = GBIF, b = Bugguide.net Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Houston | 🇺🇸 United States | |
| 3 | Miami | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Anchor Stink Bug sighting in Shenandoah National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 447th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June–July and September
In those months about 10% of wildlife watchers report an Anchor Stink Bug in Shenandoah National Park on a given day, against under 5% in August and October–May, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Anchor Stink Bug sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Shenandoah National Park, in our data
Shenandoah National Park is the only park on Wallace's Line with enough records to rate Anchor Stink Bug sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Pentatomidae
The closest relatives of the Anchor Stink Bug that you can see in Shenandoah National Park (family Pentatomidae, Stink Bugs) are Green Stink Bug (about 20%), Brown Marmorated Stink Bug (about 20%) and Twice-Stabbed Stink Bug (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Anchor Stink Bug is recorded against all the insects logged in Shenandoah National Park (8 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.
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