Prochoerodes lineola
In 3 days ~30% in a week ~60%
Prochoerodes lineola, the large maple spanworm, is a moth of the family Geometridae. It is found from Nova Scotia to Florida, west to Texas and north to Alberta. The wingspan is 35–50 mm. They are on wing from April to October in the south and from July to September in the north.
The larvae feed on the leaves of a wide range of plants, including apple, birch, blueberry, cherry, currant, geranium, grass, maple, oak, poplar, soybean, sweetfern, walnut and willow. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Elk Island National Park | 🇨🇦 Canada | |
| 4 | Point Pelee National Park | 🇨🇦 Canada | |
| 5 | Acadia National Park | 🇺🇸 United States | |
| 6 | Gros Morne National Park | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | Austin | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Edmonton | 🇨🇦 Canada | |
| 7 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 8 | Boston | 🇺🇸 United States | |
| 9 | Chicago | 🇺🇸 United States | |
| 10 | Montreal | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report a Large Maple Spanworm Moth sighting in Elk Island National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 65th most-seen of the 112 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.
August
In that month about 30% of wildlife watchers report a Large Maple Spanworm Moth in Elk Island National Park on a given day, against under 5% in October to July, the lowest months. That is one of Elk Island National Park's wettest months, with about 75 mm of rain against 20 mm in December.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Large Maple Spanworm Moth sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Among the best
Of the 6 parks where we can rate Large Maple Spanworm Moth sightings, Elk Island National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Great Smoky Mountains National Park (United States, about 10%) and Shenandoah National Park (United States, about 10%).
Same family: Geometridae
The closest relatives of the Large Maple Spanworm Moth that you can see in Elk Island National Park (family Geometridae, Geometer Moths) are Linden Looper Moth (about 10%), Pale Beauty (about 10%) and 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 Large Maple Spanworm Moth is recorded against all the insects logged in Elk Island National Park (12 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.
