Tritoxa flexa
In 3 days ~10%
Tritoxa flexa is a species of picture-winged fly in the genus Tritoxa of the family Ulidiidae. 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 | Washington | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Black Onion Fly sighting in Chicago on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 814th most-seen of the 978 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Black Onion Fly in Chicago on a given day, so our monthly data shows no clear season.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Black Onion Fly sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 2 cities where we can rate Black Onion Fly sightings, Chicago ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Washington (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Black Onion Fly is recorded against all the insects logged in Chicago (6 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.
