Temnostoma excentricum
In 3 days ~30% in a week ~60%
Temnostoma excentrica (Harris, 1841 ), the Black-spotted Falsehorn, is a common species of syrphid fly observed throughout the United States and 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. Temnostoma adults are strong wasp mimics. The larvae burrow in moist decayed wood. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Temnostoma excentricum sighting in Elk Island National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 65th most-seen of the 112 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
June
In that month about 30% of wildlife watchers report a Temnostoma excentricum in Elk Island National Park on a given day, against under 5% in August to May, the lowest months. That is one of Elk Island National Park's wettest months, with about 110 mm of rain against 20 mm in December.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Temnostoma excentricum sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 parks where we can rate Temnostoma excentricum sightings, Elk Island National Park has the highest daily chance: about 10%. Next come Acadia National Park (United States, under 5%) and Great Smoky Mountains National Park (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Temnostoma excentricum is recorded against all the insects logged in Elk Island National Park (11 verified sightings from 2019 to 2026), 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.
