Orgyia vetusta
In 3 days ~20% in a week ~30%
Orgyia vetusta, also known as the western tussock moth, formerly Hemerocampa vetusta, is a moth found in the Pacific States and British Columbia. The species is dimorphic; the females are flightless. The Western tussock moth is reported on virtually all California oak species as well as various fruit and nut trees, ceanothus, hawthorn, manzanita, pyracantha, toyon, walnut, and willow. There is an isolated population in Boise County, Idaho. This species has also been seen in U.S. gulf coast states such as Louisiana..
Tussock moth eggs are white and are laid in a mass, which overwinters. The female covers the eggs with setae. The caterpillars emerge in early spring (February-May) and exhibit minimal disperse via ballooning, a process by while caterpillars hang from silk threads and are spread by wind. This is also observed in other species within the family Erebidae, such as Lymantria dispar dispar. Larvae have hairs that may cause minor skin irritation or allergic reactions in humans. Adults emerge from cocoons between June and August.
Tussock moth caterpillars can cause damage to citrus orchards in Southern California.... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Channel Islands National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Diego | 🇺🇸 United States | |
| 2 | San Francisco | 🇺🇸 United States | |
| 3 | Sacramento | 🇺🇸 United States | |
| 4 | Los Angeles | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Western Tussock Moth sighting in San Francisco on a given day, based on 257 verified sightings from GBIF citizen-science data. It is the 80th most-seen of the 737 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.
March to June
In those months about 10% of wildlife watchers report a Western Tussock Moth in San Francisco on a given day, against under 5% in July to February, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Western Tussock Moth 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 4 cities where we can rate Western Tussock Moth sightings, San Francisco ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in San Diego (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Western Tussock Moth is recorded against all the insects logged in San Francisco (257 verified sightings), 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.
