Erynnis brizo
In 3 days ~20% in a week ~40%
Erynnis brizo, the sleepy duskywing or banded oak duskywing, is a species of Hesperiidae butterfly that occurs throughout North America and is commonly confused with E. juvenalis and E. lucilius. The species is listed as threatened in Connecticut and Maine. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States | |
| 4 | Merritt Island National Wildlife Refuge | 🇺🇸 United States | |
| 5 | Joshua Tree National Park | 🇺🇸 United States | |
| 6 | Zion National Park | 🇺🇸 United States | |
| 7 | Big Bend National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Sleepy Duskywing sighting in Joshua Tree National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 96th most-seen of the 190 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 Sleepy Duskywing in Joshua Tree National Park on a given day, against under 5% in June to February, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Sleepy Duskywing sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
5th of 7
Of the 7 parks where we can rate Sleepy Duskywing sightings, Joshua Tree National Park ranks 5th at about 10%. The best odds are in Guadalupe Mountains National Park (United States, about 20%), Great Smoky Mountains National Park (United States, about 10%) and Shenandoah National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Sleepy Duskywing is recorded against all the insects logged in Joshua Tree National Park (13 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.
