Ischiodon scutellaris
In 3 days ~20% in a week ~30%
Ischiodon scutellaris, commonly known as the common hover fly or yellow-shouldered hover fly, is a species of hover fly found in India, Turkey to Japan and Australia, as well as all the Pacific islands except for Hawaii.
Larvae feed on aphids, and are considered an effective biological control agent. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Yellow-Shouldered Hover Fly sighting in Tuen Mun on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 336th most-seen of the 557 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, May, July and September–December
In those months about 10% of wildlife watchers report a Yellow-Shouldered Hover Fly in Tuen Mun on a given day, against under 5% in January, March–April, June and August, the lowest months.
10th of 17
Of the 17 cities where we can rate Yellow-Shouldered Hover Fly sightings, Tuen Mun ranks 10th at about 10%. The best odds are in Raipur (India, about 20%), Dhaka (Bangladesh, about 20%) and Jaipur (India, about 20%).
Same family: Syrphidae
The closest relatives of the Yellow-Shouldered Hover Fly that you can see in Tuen Mun (family Syrphidae, Hover Flies) are Marmalade Hover Fly (about 10%), Mesembrius bengalensis (about 10%) and Eristalinus arvorum (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-Shouldered Hover Fly is recorded against all the insects logged in Tuen Mun (9 verified sightings), 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.
