Tropidia quadrata
In 3 days ~10% in a week ~30%
Tropidia quadrata, commonly known as the common thickleg fly, is a common species of syrphid fly observed across the north-central United states and southern Canada. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein rich pollen. The larvae are aquatic. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Toronto | 🇨🇦 Canada | |
| 3 | Denver | 🇺🇸 United States | |
| 4 | Boston | 🇺🇸 United States | |
| 5 | Montreal | 🇨🇦 Canada | |
| 6 | Chicago | 🇺🇸 United States | |
| 7 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Common Thick-Leg Fly sighting in Minneapolis [Saint Paul] on a given day, based on 29 verified sightings from GBIF citizen-science data. It is the 234th most-seen of the 672 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
July
In that month about 10% of wildlife watchers report a Common Thick-Leg Fly in Minneapolis [Saint Paul] on a given day, against under 5% in August to June, the lowest months.
Yes
Of the 7 cities where we can rate Common Thick-Leg Fly sightings, Minneapolis [Saint Paul] has the highest daily chance: under 5%. Next come Toronto (Canada, under 5%) and Denver (United States, under 5%).
Same family: Syrphidae
The closest relatives of the Common Thick-Leg Fly that you can see in Minneapolis [Saint Paul] (family Syrphidae, Hover Flies) are Margined Calligrapher (about 20%), Narrow-Headed Marsh Fly (about 20%) and Eastern Calligrapher (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Thick-Leg Fly is recorded against all the insects logged in Minneapolis [Saint Paul] (29 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.
