Promachus sackeni
In 3 days ~20% in a week ~40%
Promachus sackeni is a species of robber flies (insects in the family Asilidae). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zion National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Sacken Lion Fly sighting in Zion National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 65th most-seen of the 114 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.
August and September
In those months about 20% of wildlife watchers report a Sacken Lion Fly in Zion National Park on a given day, against under 5% in November to July, the lowest months.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Sacken Lion Fly sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Zion National Park, in our data
Zion National Park is the only park on Wallace's Line with enough records to rate Sacken Lion Fly sightings: about 10% of wildlife watchers there report one on a given day.
Same order: Diptera
The closest relatives of the Sacken Lion Fly that you can see in Zion National Park (order Diptera, Flies) are Cotton-Gall Tephritid (about 40%), Spiny Tachina Fly (about 40%) and White-Bowed Smoothwing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sacken Lion Fly is recorded against all the insects logged in Zion National Park (7 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.
