Fissicrambus mutabilis
In 3 days ~10% in a week ~20%
Fissicrambus mutabilis, the changeable grass-veneer or striped sod webworm, is a moth of the family Crambidae. It is found from Quebec to Florida, west to Texas and Illinois and north to Ontario. The wingspan is about 17 mm. Adults are on wing from June to August in two generations per year.
The larvae feed on various grasses. Partly grown larvae overwinter. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Austin | 🇺🇸 United States | |
| 6 | Washington | 🇺🇸 United States | |
| 7 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Changeable Grass-Veneer sighting in Dallas on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 1019th most-seen of the 1412 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 Changeable Grass-Veneer in Dallas on a given day, so our monthly data shows no clear season.
Among the best
Of the 7 cities where we can rate Changeable Grass-Veneer sightings, Dallas ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Chicago (United States, under 5%) and Philadelphia (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Changeable Grass-Veneer is recorded against all the insects logged in Dallas (9 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.
