Promachus vertebratus
In 3 days ~10% in a week ~20%
Promachus vertebratus is a species of robber flies (insects in the family Asilidae). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Spot-Tailed Lion Fly sighting in Chicago on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 456th most-seen of the 978 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Spot-Tailed Lion Fly in Chicago on a given day, so our monthly data shows no clear season.
Only Chicago, in our data
Chicago is the only city on Wallace's Line with enough records to rate Spot-Tailed Lion Fly sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Spot-Tailed Lion Fly is recorded against all the insects logged in Chicago (22 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.
