Eacles oslari
In 3 days ~10% in a week ~30%
Eacles oslari, or Oslar's eacles, is a moth of the family Saturniidae. It is found from the Santa Rita, Patagonia, Atascosa and Huachuca mountains of southern Arizona south into Sonora, Sinaloa and Chihuahua in Mexico. Wings vary from yellow to purple brown. The species was first described by Walter Rothschild and Ernest J. Oslar in 1907. Oslar was the first entomology curator for the Colorado Museum of Natural History (currently the Denver Museum of Nature & Science). Oslar was employed by Rothchild to provide specimens, and the moth was later named after him.
The wingspan 112–146 mm. Adults are on wing from July to August. They are vulnerable to predation from bats. The larvae feed on Quercus oblongifolia, Quercus emoryi and Sapindus saponaria drummondii. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report an Oslar's Imperial Moth sighting in Cumbres de Monterrey National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 188th most-seen of the 431 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.
August and September
In those months about 10% of wildlife watchers report an Oslar's Imperial Moth in Cumbres de Monterrey National Park on a given day, against under 5% in October to July, the lowest months. Those are among Cumbres de Monterrey National Park's wettest months, with about 140 mm of rain a month against 20 mm in December.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Oslar's Imperial Moth sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Cumbres de Monterrey National Park, in our data
Cumbres de Monterrey National Park is the only park on Wallace's Line with enough records to rate Oslar's Imperial Moth sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Oslar's Imperial Moth is recorded against all the insects logged in Cumbres de Monterrey National Park (14 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.
