Polystepha pilulae
In 3 days ~20% in a week ~40%
Polystepha pilulae, the oak leaf gall midge, is a species of gall midge in the family Cecidomyiidae. It is found in eastern North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Detroit | 🇺🇸 United States | |
| 6 | New York City | 🇺🇸 United States | |
| 7 | Philadelphia | 🇺🇸 United States | |
| 8 | Chicago | 🇺🇸 United States | |
| 9 | Baltimore | 🇺🇸 United States | |
| 10 | Toronto | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report an Oak Leaf Gall Midge sighting in Minneapolis [Saint Paul] on a given day, based on 66 verified sightings from GBIF citizen-science data. It is the 136th most-seen of the 672 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
November
In that month about 20% of wildlife watchers report an Oak Leaf Gall Midge in Minneapolis [Saint Paul] on a given day, against under 5% in April to July, the lowest months. That is one of Minneapolis [Saint Paul]'s driest months, with about 35 mm of rain against 130 mm in June.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Oak Leaf Gall Midge sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 10 cities where we can rate Oak Leaf Gall Midge sightings, Minneapolis [Saint Paul] ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Boston (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Oak Leaf Gall Midge is recorded against all the insects logged in Minneapolis [Saint Paul] (66 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.
