Melangyna viridiceps
In 3 days ~20% in a week ~40%
Melangyna viridiceps is an Australian hoverfly, known as the common hover fly. It is one of the two most common hoverflies in Australia, alongside Simosyrphus grandicornis, with which it has often been confused, but can be distinguished by its all black thorax.
M. viridiceps has a body up to 1 cm in length. The adult flies feed on pollen and nectar which they gather from flowers, while the larvae feed on aphids. It is found widely across Eastern Australia. Some sources indicate that the species is also present in New Zealand, either on the Kermadec Islands only, or on both the Kermadecs and the mainland. Most recent sources, however, do not record this species as being present outside of Australia. Miller's 1921 mention for the Kermadec was found to be a misidentification for Simosyrphus grandicornis, and Macfarlane et al. failed to cite specimens or published reports for their claim of the species' presence in the Kermadec.
Data related to Melangyna viridiceps at Wikispecies Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grampians National Park | 🇦🇺 Australia | |
| 2 | Hattah-Kulkyne National Park | 🇦🇺 Australia | |
| 3 | Great Otway National Park | 🇦🇺 Australia | |
| 4 | Blue Mountains National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Common Halfband sighting in Blue Mountains National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 213th 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 40%, if each day is a fresh chance.
November
In that month about 20% of wildlife watchers report a Common Halfband in Blue Mountains National Park on a given day, against under 5% in January–March and May–June, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Common Halfband sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Common Halfband sightings, Blue Mountains National Park ranks 4th at about 10%. The best odds are in Grampians National Park (Australia, about 20%), Hattah-Kulkyne National Park (Australia, about 10%) and Great Otway National Park (Australia, about 10%).
Same family: Syrphidae
The closest relatives of the Common Halfband that you can see in Blue Mountains National Park (family Syrphidae, Hover Flies) are Yellow-Shouldered Stout Hover Fly (about 10%), Common Drone 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 Common Halfband is recorded against all the insects logged in Blue Mountains National Park (21 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.
