Lambdina fiscellaria
In 3 days ~30% in a week ~60%
Lambdina fiscellaria, the mournful thorn or hemlock looper, is a moth of the family Geometridae. It is found in North America, from the Pacific to the Atlantic coast and from Canada south to Pennsylvania, Wisconsin and California.
The wingspan is about 35 mm. The moth flies from August to early October depending on the location. The larvae feed on hemlock, balsam fir, white spruce, oak and other hardwoods. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gros Morne National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 4 | Olympic National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Hemlock Looper Moth sighting in Vancouver on a given day, based on 348 verified sightings from GBIF citizen-science data. It is the 16th most-seen of the 482 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
September
In that month about 40% of wildlife watchers report a Hemlock Looper Moth in Vancouver on a given day, against under 5% in November to June, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Hemlock Looper 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.
Yes
Of the 3 cities where we can rate Hemlock Looper Moth sightings, Vancouver has the highest daily chance: about 10%. Next come Portland (United States, under 5%) and Seattle (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Hemlock Looper Moth is recorded against all the insects logged in Vancouver (348 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.
