Ischiodon scutellaris
In 3 days ~10% 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.
Rare
Under 5% of wildlife watchers report a Yellow-Shouldered Hover Fly sighting in Chennai on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 338th most-seen of the 376 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.
December to March
In those months about 10% of wildlife watchers report a Yellow-Shouldered Hover Fly in Chennai on a given day, against under 5% in April to November, the lowest months. Those are among Chennai's driest months, with about 40 mm of rain a month against 290 mm in November.
13th of 17
Of the 17 cities where we can rate Yellow-Shouldered Hover Fly sightings, Chennai ranks 13th at under 5%. 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 Chennai (5 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.
