Paradejeania rutilioides
In 3 days ~80% in a week >90%
Paradejeania rutilioides, known generally as the spiny tachina fly or hedgehog fly, is a species of bristle fly in the family Tachinidae. North and Central America Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zion National Park | 🇺🇸 United States | |
| 2 | Grand Canyon National Park | 🇺🇸 United States |
Likely
About 40% of wildlife watchers report a Spiny Tachina Fly sighting in Zion National Park on a given day, based on 110 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 114 insects we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
October
In that month about 80% of wildlife watchers report a Spiny Tachina Fly in Zion National Park on a given day, against under 5% in December to July, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Spiny Tachina Fly sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Spiny Tachina Fly sightings, Zion National Park has the highest daily chance: about 40%. Next come Grand Canyon National Park (United States, about 10%).
Same order: Diptera
The closest relatives of the Spiny Tachina Fly that you can see in Zion National Park (order Diptera, Flies) are Cotton-Gall Tephritid (about 40%), Sacken Lion Fly (about 10%) 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 Spiny Tachina Fly is recorded against all the insects logged in Zion National Park (110 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.
