Pyrausta semirubralis
In 3 days ~20% in a week ~30%
Pyrausta semirubralis is a moth in the family Crambidae. It was described by Alpheus Spring Packard in 1873. It is found in North America, where it has been recorded from southern British Columbia to California, Nevada, Colorado and Arizona. The habitat consists of coastal areas, reaching inland up to altitudes of about 9000 ft.
The length of the forewings is 9–11 mm. The basal half of the forewings is dull dark brown. The remaining area is dull brick red. The hindwings are faded brick red. Adults have been recorded on wing from April to September. peaking around May Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Yosemite National Park | 🇺🇸 United States | |
| 3 | Olympic National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Rusty Pyrausta sighting in Yosemite National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 124th most-seen of the 227 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Rusty Pyrausta in Yosemite National Park on a given day, against under 5% in August to May, the lowest months. Those are among Yosemite National Park's driest months, with about 25 mm of rain a month against 220 mm in January.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Rusty Pyrausta sightings with a recorded time, and about 8 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 Rusty Pyrausta sightings, Yosemite National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Sequoia and Kings Canyon National Parks (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Rusty Pyrausta is recorded against all the insects logged in Yosemite National Park (12 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.
