Ptecticus trivittatus
In 3 days ~10% in a week ~20%
Ptecticus trivittatus is a species of soldier fly in the family Stratiomyidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Detroit | 🇺🇸 United States | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Boston | 🇺🇸 United States | |
| 4 | Montreal | 🇨🇦 Canada | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Toronto | 🇨🇦 Canada | |
| 7 | Baltimore | 🇺🇸 United States | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | New York City | 🇺🇸 United States | |
| 10 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Compost Fly sighting in Chicago on a given day, based on 57 verified sightings from GBIF citizen-science data. It is the 245th most-seen of the 978 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.
June to August
In those months about 10% of wildlife watchers report a Compost Fly in Chicago on a given day, against under 5% in September to May, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Compost Fly sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
10th of 11
Of the 11 cities where we can rate Compost Fly sightings, Chicago ranks 10th at under 5%. The best odds are in Detroit (United States, about 10%), Minneapolis [Saint Paul] (United States, about 10%) and Boston (United States, about 10%).
Same order: Diptera
The closest relatives of the Compost Fly that you can see in Chicago (order Diptera, Flies) are Margined Calligrapher (about 10%), Narrow-Headed Marsh Fly (about 10%) and Common Picture-Winged Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Compost Fly is recorded against all the insects logged in Chicago (57 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.
