Judolia instabilis
In 3 days ~20% in a week ~40%
Judolia instabilis is a species of beetle in the family Cerambycidae. It was described by Haldeman in 1847. Their appearance ranges from black with yellow spots to full black in color. They range in size from 6 mm to 15 mm in length. They inhabit the U.S and Canada. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Yosemite National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Judolia instabilis sighting in Yosemite National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 90th 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 40%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a Judolia instabilis in Yosemite National Park on a given day, against under 5% in September to June, 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 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Judolia instabilis 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 2 parks where we can rate Judolia instabilis 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%).
Same family: Cerambycidae
The closest relatives of the Judolia instabilis that you can see in Yosemite National Park (family Cerambycidae, Longhorn Beetles) are White-Spotted Sawyer (about 10%), Dimorphic Flower Longhorn Beetle (about 10%) and Monochamus obtusus (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Judolia instabilis is recorded against all the insects logged in Yosemite National Park (16 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.
