Hydrellia tritici
In 3 days ~20% in a week ~30%
Hydrellia tritici, the black pasture fly or shore fly, is an insect native to Australia. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Otway National Park | 🇦🇺 Australia | |
| 2 | Blue Mountains National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Black Pasture Fly sighting in Blue Mountains National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 359th most-seen of the 789 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
February, August and October–December
In those months about 10% of wildlife watchers report a Black Pasture Fly in Blue Mountains National Park on a given day, against under 5% in January, March–July and September, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Black Pasture Fly sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 2 parks where we can rate Black Pasture Fly sightings, Blue Mountains National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Great Otway National Park (Australia, about 10%).
Same order: Diptera
The closest relatives of the Black Pasture Fly that you can see in Blue Mountains National Park (order Diptera, Flies) are Australian Wingless Soldier Fly (about 10%), Yellow-Shouldered Stout Hover Fly (about 10%) and Common Drone Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Pasture Fly is recorded against all the insects logged in Blue Mountains 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.
