Tetracis crocallata
In 3 days ~10% in a week ~30%
Tetracis crocallata is a moth of the family Geometridae first described by Achille Guenée in 1858. It is found in North America from Nova Scotia, New Brunswick, southern Manitoba and southern Saskatchewan to Alberta, south to northern Florida, west to Kansas, Nebraska, North Dakota and extreme eastern Texas.
The length of the forewings 17–25 mm. Adults are on wing from May to August depending on the location. There are two generations in New York and southward. The larvae feed on Alnus, Castanea and Salix species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States | |
| 4 | Acadia National Park | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Yellow Slant-Line sighting in Acadia National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 347th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 10%, 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 Yellow Slant-Line in Acadia National Park on a given day, against under 5% in August to May, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Yellow Slant-Line sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
4th of 4
Of the 4 parks where we can rate Yellow Slant-Line sightings, Acadia National Park ranks 4th at under 5%. The best odds are in Point Pelee National Park (Canada, about 10%), Great Smoky Mountains National Park (United States, about 10%) and Shenandoah National Park (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Yellow Slant-Line is recorded against all the insects logged in Acadia National Park (5 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.
