Tropidia albistylum
In 3 days ~10%
Tropidia albistylum (Macquart, 1847), the Yellow-thighed Thickleg Fly, is a rare species of syrphid fly observed across the eastern and central United States. 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 | Washington | 🇺🇸 United States | |
| 2 | Boston | 🇺🇸 United States | |
| 3 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Yellow-Thighed Thick-Leg Fly sighting in New York City on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 880th most-seen of the 1623 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 Yellow-Thighed Thick-Leg Fly in New York City on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Yellow-Thighed Thick-Leg Fly sightings, New York City ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Washington (United States, under 5%) and Boston (United States, under 5%).
Same family: Syrphidae
The closest relatives of the Yellow-Thighed Thick-Leg Fly that you can see in New York City (family Syrphidae, Hover Flies) are Eurasian Drone Fly (about 20%), Margined Calligrapher (about 10%) 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 Yellow-Thighed Thick-Leg Fly is recorded against all the insects logged in New York City (13 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.
