Chlorochroa sayi
In 3 days ~20% in a week ~40%
Chlorochroa sayi, or Say's stink bug, is a species of stink bug in the family Pentatomidae. It is found in North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Death Valley National Park | 🇺🇸 United States | |
| 2 | Grand Canyon National Park | 🇺🇸 United States | |
| 3 | Joshua Tree National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Las Vegas | 🇺🇸 United States | |
| 2 | Mesa | 🇺🇸 United States | |
| 3 | Phoenix | 🇺🇸 United States | |
| 4 | Salt Lake City | 🇺🇸 United States | |
| 5 | Denver | 🇺🇸 United States | |
| 6 | Los Angeles | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Say's Stink Bug sighting in Grand Canyon National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 68th most-seen of the 143 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.
May–July and October
In those months about 10% of wildlife watchers report a Say's Stink Bug in Grand Canyon National Park on a given day, against under 5% in August–September and November–April, the lowest months. Those are among Grand Canyon National Park's driest months, with about 10 mm of rain a month against 40 mm in March.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Say's 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.
Among the best
Of the 3 parks where we can rate Say's Stink Bug sightings, Grand Canyon National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Death Valley National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Say's Stink Bug is recorded against all the insects logged in Grand Canyon National Park (11 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.
