Promachus yesonicus
In 3 days ~30% in a week ~60%
Promachus yesonicus, or shioya-abu (塩屋虻, シオヤアブ) in Japanese, is a species of robber flies. In Japanese, "shioya" means a salt merchant (someone who makes or deals in salt), and "abu" means a horse-fly. This insect is called "shioya-abu" because the males have a white tip to their tail that resembles salt. 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 Promachus yesonicus sighting in Tokyo on a given day, based on 325 verified sightings from GBIF citizen-science data. It is the 42nd most-seen of the 1013 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
July
In that month about 30% of wildlife watchers report a Promachus yesonicus in Tokyo on a given day, against under 5% in September to April, the lowest months.
5th of 7
Of the 7 cities where we can rate Promachus yesonicus sightings, Tokyo ranks 5th at about 10%. The best odds are in Daejeon (South Korea, about 20%), Hiroshima (Japan, about 20%) and Osaka (Japan, about 20%).
GBIF citizen-science records
It is estimated from how often the Promachus yesonicus is recorded against all the insects logged in Tokyo (325 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.
