Prochoerodes lineola
In 3 days ~20% in a week ~40%
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 Baltimore on a given day, based on 36 verified sightings from GBIF citizen-science data. It is the 146th most-seen of the 705 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 November
In those months about 10% of wildlife watchers report a Large Maple Spanworm Moth in Baltimore on a given day, against under 5% in December to May, the lowest months.
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.
Yes
Of the 15 cities where we can rate Large Maple Spanworm Moth sightings, Baltimore has the highest daily chance: about 10%. Next come Detroit (United States, about 10%) and Austin (United States, under 5%).
Same family: Geometridae
The closest relatives of the Large Maple Spanworm Moth that you can see in Baltimore (family Geometridae, Geometer Moths) are Common Tan Wave (about 10%), Large Lace-Border Moth (about 10%) and Tulip-Tree Beauty (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 Baltimore (36 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.
