Bibio albipennis
In 3 days ~10% in a week ~20%
Bibio albipennis is a species of March fly. It native to North America, where it is widespread. The larvae are detrivores. J. W. P. Jenks found them to be a seasonal food source for robins. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Salt Lake City | 🇺🇸 United States | |
| 2 | San Francisco | 🇺🇸 United States | |
| 3 | Los Angeles | 🇺🇸 United States | |
| 4 | Sacramento | 🇺🇸 United States | |
| 5 | Seattle | 🇺🇸 United States | |
| 6 | Toronto | 🇨🇦 Canada | |
| 7 | Denver | 🇺🇸 United States | |
| 8 | Vancouver | 🇨🇦 Canada | |
| 9 | Chicago | 🇺🇸 United States | |
| 10 | Montreal | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a White-Winged March Fly sighting in San Francisco on a given day, based on 116 verified sightings from GBIF citizen-science data. It is the 139th most-seen of the 737 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.
March and April
In those months about 10% of wildlife watchers report a White-Winged March Fly in San Francisco on a given day, against under 5% in May to February, the lowest months.
Among the best
Of the 11 cities where we can rate White-Winged March Fly sightings, San Francisco ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Salt Lake City (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the White-Winged March Fly is recorded against all the insects logged in San Francisco (116 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.
