Lycia ursaria
In 3 days ~10% in a week ~20%
Lycia ursaria, the stout spanworm moth or bear, is a moth of the family Geometridae. The species was first described by Francis Walker in 1860. It is found in southern Canada and the northern United States, south to New Jersey and Iowa.
The wingspan is about 45 mm. Adults are on wing from March to June in one generation per year. The larvae feed on the leaves of various broadleaved trees and shrubs, including Alnus, Malus, Fraxinus, Tilia, Betula, Vaccinium, Cornus, Ulmus, Crataegus, Populus and Salix. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Edmonton | 🇨🇦 Canada | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Stout Spanworm Moth sighting in Toronto on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 945th most-seen of the 1689 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Stout Spanworm Moth in Toronto on a given day, so our monthly data shows no clear season.
Among the best
Of the 4 cities where we can rate Stout Spanworm Moth sightings, Toronto ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Edmonton (Canada, under 5%) and Minneapolis [Saint Paul] (United States, under 5%).
Same family: Geometridae
The closest relatives of the Stout Spanworm Moth that you can see in Toronto (family Geometridae, Geometer Moths) are Chickweed Geometer Moth (about 10%), Pale Beauty (about 10%) and Single-Dotted Wave (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Stout Spanworm Moth is recorded against all the insects logged in Toronto (13 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.
