Paradejeania rutilioides
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Spiny Tachina Fly sighting in Grand Canyon National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 95th most-seen of the 143 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 to November
In those months about 10% of wildlife watchers report a Spiny Tachina Fly in Grand Canyon 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.
2nd of 2
Of the 2 parks where we can rate Spiny Tachina Fly sightings, Grand Canyon National Park ranks 2nd at about 10%. The best odds are in Zion National Park (United States, about 40%).
Same order: Diptera
The closest relatives of the Spiny Tachina Fly that you can see in Grand Canyon National Park (order Diptera, Flies) are Cotton-Gall Tephritid (about 20%), Large-Tailed Aphideater (about 10%) and Yellow-Shouldered Drone Fly (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 Grand Canyon National Park (8 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.
