Orthoprosopa grisea
In 3 days ~10% in a week ~30%
Orthoprosopa grisea is a species of hoverfly in the family Syrphidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grampians National Park | 🇦🇺 Australia | |
| 2 | Great Otway National Park | 🇦🇺 Australia | |
| 3 | Blue Mountains National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report an Orthoprosopa grisea sighting in Great Otway National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 369th most-seen of the 418 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April and December–January
In those months about 10% of wildlife watchers report an Orthoprosopa grisea in Great Otway National Park on a given day, against under 5% in February–March and May–November, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Orthoprosopa grisea sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 3
Of the 3 parks where we can rate Orthoprosopa grisea sightings, Great Otway National Park ranks 2nd at under 5%. The best odds are in Grampians National Park (Australia, about 10%).
Same family: Syrphidae
The closest relatives of the Orthoprosopa grisea that you can see in Great Otway National Park (family Syrphidae, Hover Flies) are Common Halfband (about 10%), Yellow-Shouldered Stout Hover Fly (about 10%) and Native Drone Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Orthoprosopa grisea is recorded against all the insects logged in Great Otway National Park (10 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.
