Tetracis cervinaria
In 3 days ~10%
Tetracis cervinaria is a moth of the family Geometridae first described by Alpheus Spring Packard in 1871. It is found in North America from British Columbia south to Kern County, California and eastward to western Montana, south-eastern Idaho, Carbon County, Wyoming and Larimer County, Colorado. It is found at elevations of 790 to 2,375 meters.
The length of the forewings 19–23 mm. Adults are on wing from February to June. The larvae feed on Prunus emarginata and Prunus virginiana. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Elegant Thorn sighting in San Francisco on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 577th most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Elegant Thorn in San Francisco on a given day, so our monthly data shows no clear season.
Only San Francisco, in our data
San Francisco is the only city on Wallace's Line with enough records to rate Elegant Thorn sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Elegant Thorn is recorded against all the insects logged in San Francisco (7 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.
