Arenivaga bolliana
In 3 days ~10% in a week ~30%
Arenivaga bolliana, known generally as the Boll's sand cockroach or Boll's sandroach, is a species of cockroach in the family Corydiidae. It is found in North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Antonio | 🇺🇸 United States | |
| 2 | Mesa | 🇺🇸 United States | |
| 3 | Austin | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Boll’s Sandroach sighting in Big Bend National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 283rd most-seen of the 329 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.
May–June and September
In those months about 10% of wildlife watchers report a Boll’s Sandroach in Big Bend National Park on a given day, against under 5% in July–August and October–April, the lowest months. Those are among Big Bend National Park's wettest months, with about 30 mm of rain a month against 10 mm in April.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Boll’s Sandroach sightings with a recorded time, and nearly all of them come between 6 pm and 6 am: it is mostly seen at night.
Only Big Bend National Park, in our data
Big Bend National Park is the only park on Wallace's Line with enough records to rate Boll’s Sandroach sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Boll’s Sandroach is recorded against all the insects logged in Big Bend 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.
