Harrisina metallica
In 3 days ~20% in a week ~30%
Harrisina metallica, the western grapeleaf skeletonizer, is a species of moth of the family Zygaenidae. It is found in the Southwestern United States, from California to Texas, north to Colorado and Utah and in northern Mexico.
The wingspan is 22–30 millimetres (0.87–1.18 in). Adults are on wing from April to October depending on the location. The larvae feed on grapes and species of Parthenocissus. Some choose to call these larvae "grape worms" because of their impeccable taste for such a sweet fruit they're laid upon by their parents. The caterpillar also have stinging hairs that can cause rash or allergic reaction.
They are in fact natures pest to precious to many grape vineyards affecting the crops yield for the season. The problem can be simply taken care of by bacteria-based insecticide, organically certified. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Western Grapeleaf Skeletonizer Moth sighting in Saguaro National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 144th most-seen of the 354 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 to October
In those months about 10% of wildlife watchers report a Western Grapeleaf Skeletonizer Moth in Saguaro National Park on a given day, against under 5% in November to May, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Western Grapeleaf Skeletonizer Moth sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Saguaro National Park, in our data
Saguaro National Park is the only park on Wallace's Line with enough records to rate Western Grapeleaf Skeletonizer Moth sightings: about 10% of wildlife watchers there report one on a given day.
Same order: Lepidoptera
The closest relatives of the Western Grapeleaf Skeletonizer Moth that you can see in Saguaro National Park (order Lepidoptera, Butterflies and Moths) are Queen (about 40%), Empress Leilia (about 30%) and American Snout (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Grapeleaf Skeletonizer Moth is recorded against all the insects logged in Saguaro National Park (15 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.
