Tropidia quadrata
In 3 days ~10% in a week ~20%
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 Toronto on a given day, based on 60 verified sightings from GBIF citizen-science data. It is the 323rd most-seen of the 1689 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
In that month about 10% of wildlife watchers report a Common Thick-Leg Fly in Toronto on a given day, against under 5% in July to May, the lowest months.
Among the best
Of the 7 cities where we can rate Common Thick-Leg Fly sightings, Toronto ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Minneapolis [Saint Paul] (United States, under 5%).
Same family: Syrphidae
The closest relatives of the Common Thick-Leg Fly that you can see in Toronto (family Syrphidae, Hover Flies) are Eastern Calligrapher (about 10%), Margined Calligrapher (about 10%) and Transverse-Banded Flower Fly (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 Toronto (60 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.
