Macaria pustularia
In 3 days ~20% in a week ~40%
Speranza pustularia, the lesser maple spanworm, is a moth of the family Geometridae native to North America. Adults are on wing from May to July in the south and from June to August in the north. There is one generation per year. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cape Breton Highlands National Park | 🇨🇦 Canada | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Acadia National Park | 🇺🇸 United States | |
| 4 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Detroit | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | Montreal | 🇨🇦 Canada | |
| 4 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Boston | 🇺🇸 United States | |
| 7 | Baltimore | 🇺🇸 United States | |
| 8 | New York City | 🇺🇸 United States | |
| 9 | Washington | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Lesser Maple Spanworm Moth sighting in Shenandoah National Park on a given day, based on 17 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 234th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a Lesser Maple Spanworm Moth in Shenandoah National Park on a given day, against under 5% in September to May, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Lesser Maple Spanworm Moth sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
4th of 4
Of the 4 parks where we can rate Lesser Maple Spanworm Moth sightings, Shenandoah National Park ranks 4th at about 10%. The best odds are in Cape Breton Highlands National Park (Canada, about 20%), Great Smoky Mountains National Park (United States, about 10%) and Acadia National Park (United States, about 10%).
Same family: Geometridae
The closest relatives of the Lesser Maple Spanworm Moth that you can see in Shenandoah National Park (family Geometridae, Geometer Moths) are Tulip-Tree Beauty (about 20%), Pale Beauty (about 10%) and Large Maple Spanworm Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Lesser Maple Spanworm Moth is recorded against all the insects logged in Shenandoah National Park (17 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.
