Laphria thoracica
In 3 days ~20% in a week ~40%
Laphria thoracica is a species of robber flies in the family Asilidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Montreal | 🇨🇦 Canada | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | Detroit | 🇺🇸 United States | |
| 6 | Chicago | 🇺🇸 United States | |
| 7 | Baltimore | 🇺🇸 United States | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | New York City | 🇺🇸 United States | |
| 10 | Philadelphia | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Eastern Yellow-Backed Laphria sighting in Shenandoah National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 284th most-seen of the 723 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.
May
In that month about 20% of wildlife watchers report an Eastern Yellow-Backed Laphria in Shenandoah National Park on a given day, against under 5% in August to March, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Eastern Yellow-Backed Laphria 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 2 parks where we can rate Eastern Yellow-Backed Laphria sightings, Shenandoah National Park has the highest daily chance: about 10%. Next come Great Smoky Mountains National Park (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Eastern Yellow-Backed Laphria is recorded against all the insects logged in Shenandoah National Park (13 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.
