Ischiodon scutellaris
In 3 days ~20% in a week ~40%
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 Hong Kong on a given day, based on 39 verified sightings from GBIF citizen-science data. It is the 261st most-seen of the 1125 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.
October
In that month about 20% of wildlife watchers report a Yellow-Shouldered Hover Fly in Hong Kong on a given day, against under 5% in March–August and December, the lowest months. That is one of Hong Kong's driest months, with about 50 mm of rain against 280 mm in June.
7th of 17
Of the 17 cities where we can rate Yellow-Shouldered Hover Fly sightings, Hong Kong ranks 7th at about 10%. The best odds are in Raipur (India, about 20%), Dhaka (Bangladesh, about 20%) and Jaipur (India, about 20%).
GBIF citizen-science records
It is estimated from how often the Yellow-Shouldered Hover Fly is recorded against all the insects logged in Hong Kong (39 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.
